# Day 19: Medicines, read back

> Nine in ten women take some medicine in pregnancy. Before you stop or start anything, the rule is one call. Today: the list for your first visit, and a free number to ask.

- Series: Your first month of pregnancy, day by day (https://chorevia.com/learn/pregnancy-month-1), day 19 of 280, 2 weeks + 5 days
- Your baby this week: a single cell, then a ball of cells
- Canonical URL: https://chorevia.com/learn/pregnancy-month-1/day-19
- Last reviewed: 2026-10-22
- Publisher: Chorevia (https://chorevia.com)
- Cite as: Chorevia. "Day 19: Medicines, read back." Last reviewed October 22, 2026. https://chorevia.com/learn/pregnancy-month-1/day-19

This guide is general education that summarizes published research and guidance from groups like the American Academy of Pediatrics, the CDC, and the WHO. It isn’t medical advice, and every child develops on their own timeline. Your pediatrician knows your child; if something feels wrong, call them. In an emergency, call 911.

You may have taken something in these weeks: a painkiller, an allergy tablet, a prescription you have taken for years. Today is about not panicking, and not stopping anything on your own.

## Your baby

Around now, the cells are a cluster, still working toward the wall of the womb ([NICHD](https://www.nichd.nih.gov/health/topics/pregnancy/conditioninfo)). Week 5 marks the start of the embryonic period, when the major systems begin to develop, and MedlinePlus identifies it as the time of highest risk from harmful exposures in the first trimester ([MedlinePlus](https://medlineplus.gov/ency/article/002398.htm)). That is why medicine questions belong at the top of the first-visit list: the weeks after this one matter most.

## Your body

About 9 in 10 women report taking some type of medicine during pregnancy, and about 7 in 10 report at least one prescription medicine ([CDC](https://www.cdc.gov/medicine-and-pregnancy/about/index.html)). Fewer than 10% of medicines approved since 1980 have enough information to determine their safety during pregnancy, partly because pregnant women are often excluded from the studies ([CDC](https://www.cdc.gov/medicine-and-pregnancy/about/index.html)). The CDC's rule is one sentence: talk to your healthcare providers before starting or stopping any medicines ([CDC](https://www.cdc.gov/medicine-and-pregnancy/about/index.html)).

That cuts both ways. The NHS says to tell your specialist or GP about any long-term condition and not to stop regular medication without advice ([NHS](https://www.nhs.uk/best-start-in-life/pregnancy/week-by-week-guide-to-pregnancy/1st-trimester/week-4/)). Be cautious with online "safe medicine" lists; many lack sufficient scientific evidence ([CDC](https://www.cdc.gov/medicine-and-pregnancy/about/index.html)). Some studies have linked acetaminophen use in pregnancy, especially chronic use, to autism and ADHD, though a direct causal relationship has not been established; the CDC's wording is that pregnant women should consider avoiding it as a precaution ([CDC](https://www.cdc.gov/medicine-and-pregnancy/about/index.html)). Ask before you take it, and ask before you go without it.

## Try today

### The medicine cabinet list

- **Time:** 10 minutes

1. Empty the cabinet, the bedside drawer, and your bag onto the table.
2. Write down every prescription, every over-the-counter medicine, and every supplement, including dietary and herbal ones, with the dose and how often you take it; that is the list the doctor wants to talk through ([Office on Women's Health](https://womenshealth.gov/pregnancy/you-get-pregnant/preconception-health)).
3. Add anything you took in the last month and have already finished.
4. Take the list to the first visit; some medicines, including some acne treatments and dietary and herbal supplements, can harm the fetus, and prenatal care is where that gets sorted ([NICHD](https://www.nichd.nih.gov/health/topics/pregnancy/conditioninfo/prenatal-care)).

**Make it work:** Keep taking what you've been prescribed until a provider tells you otherwise ([NHS](https://www.nhs.uk/best-start-in-life/pregnancy/week-by-week-guide-to-pregnancy/1st-trimester/week-4/)). The list is for a conversation, not a cull.

## Watch for

- **Normal:** a low-grade fever with a cold, which generally does not require medication ([CDC](https://www.cdc.gov/medicine-and-pregnancy/about/index.html)). **Call your provider** for a fever of 100.4°F (38°C) or higher ([CDC](https://www.cdc.gov/hearher/maternal-warning-signs/index.html)); high fevers have been associated with birth defects ([CDC](https://www.cdc.gov/medicine-and-pregnancy/about/index.html)).
- **Normal:** wondering whether a tablet you took three weeks ago mattered. **Call your provider** rather than stopping a regular medication on your own ([NHS](https://www.nhs.uk/best-start-in-life/pregnancy/week-by-week-guide-to-pregnancy/1st-trimester/week-4/)).
- **Normal:** feeling fine, with no sign that anything is different; some people have none of the common symptoms ([NICHD](https://www.nichd.nih.gov/health/topics/pregnancy/conditioninfo/signs)). **Call your provider today** for extreme swelling of your hands or face, or severe swelling, redness, or pain in a leg or arm, at any point in pregnancy ([CDC](https://www.cdc.gov/hearher/maternal-warning-signs/index.html)).

## For you

MotherToBaby answers medicine questions free and confidentially, in English or Spanish, by phone at 1-866-626-6847, by chat, or by email ([CDC](https://www.cdc.gov/medicine-and-pregnancy/about/index.html)). It exists for the 2 a.m. question about the thing you took before you knew. Use it before the search bar.

If you're the partner: your job is the list, if she is tired, and the phone, if she is worried. Don't tell her a medicine is fine, and don't tell her it isn't; online lists that say either often lack the evidence they claim ([CDC](https://www.cdc.gov/medicine-and-pregnancy/about/index.html)).

## Sources

- Eunice Kennedy Shriver National Institute of Child Health and Human Development. "About Pregnancy." National Institutes of Health. https://www.nichd.nih.gov/health/topics/pregnancy/conditioninfo
- MedlinePlus. "Fetal development." National Library of Medicine, Medical Encyclopedia. https://medlineplus.gov/ency/article/002398.htm
- Centers for Disease Control and Prevention. "Medicine and Pregnancy: An Overview." https://www.cdc.gov/medicine-and-pregnancy/about/index.html
- NHS. "Week 4." Week-by-week guide to pregnancy, Best Start in Life. https://www.nhs.uk/best-start-in-life/pregnancy/week-by-week-guide-to-pregnancy/1st-trimester/week-4/
- Office on Women's Health. "Preconception health." U.S. Department of Health and Human Services, 2025. https://womenshealth.gov/pregnancy/you-get-pregnant/preconception-health
- Eunice Kennedy Shriver National Institute of Child Health and Human Development. "What is prenatal care and why is it important?" National Institutes of Health. https://www.nichd.nih.gov/health/topics/pregnancy/conditioninfo/prenatal-care
- Centers for Disease Control and Prevention. "Urgent Maternal Warning Signs and Symptoms." HEAR HER campaign, 2024. https://www.cdc.gov/hearher/maternal-warning-signs/index.html
- Eunice Kennedy Shriver National Institute of Child Health and Human Development. "What are some common signs of pregnancy?" National Institutes of Health. https://www.nichd.nih.gov/health/topics/pregnancy/conditioninfo/signs