If you suspect food poisoning while pregnant, the most important first step is to stay hydrated and contact your healthcare provider. Even mild foodborne infections can cause complications during pregnancy, including premature delivery and, in rare cases, miscarriage or stillbirth. You don’t need to wait for severe symptoms to make that call. A fever with body aches during pregnancy warrants a conversation with your provider, even if the same illness wouldn’t concern you outside of pregnancy.
Why Pregnancy Raises the Stakes
Your immune system naturally dials down during pregnancy to protect the baby, which makes you more vulnerable to infections from contaminated food. Most cases of food poisoning resolve on their own in a day or two with no lasting harm. But certain pathogens, particularly Listeria, Salmonella, and Toxoplasma, pose risks that go beyond an uncomfortable few days.
Listeria is the one providers worry about most. Symptoms can look like a mild flu (fever, muscle aches, fatigue) and may not appear for days or even weeks after eating contaminated food. You might feel only slightly off, but Listeria can cross the placenta and cause miscarriage, premature labor, stillbirth, or serious health problems for the newborn. Your provider can confirm a Listeria infection with a blood culture, and early treatment with antibiotics can protect the baby.
Toxoplasma, the parasite found in undercooked meat and cat litter, works differently depending on timing. Infection in early pregnancy has a low chance of reaching the fetus (under 6%), but when it does, the effects tend to be severe. In the third trimester, transmission rates jump to 60% to 81%, though the consequences are typically less serious at that stage. An infection up to three months before conception can also carry some risk.
Steps to Take Right Now
Focus on fluids first. Vomiting and diarrhea strip water and electrolytes from your body fast, and dehydration during pregnancy can reduce amniotic fluid levels and stress the baby. Sip water, clear broth, or an oral rehydration solution steadily throughout the day. Small, frequent sips work better than drinking large amounts at once, especially if you’re vomiting. Aim for at least two liters a day if you can keep it down.
Rest as much as possible and let your stomach settle before reintroducing solid food. When you’re ready, start with bland, easy-to-digest foods: plain toast, rice, bananas, applesauce. These won’t irritate your stomach the way rich, fatty, or spicy meals will. Gradually return to your normal diet as your symptoms improve, making sure you’re still meeting your pregnancy nutrition needs.
For medication, your options are limited. Vitamin B6 is considered safe for nausea during pregnancy. For diarrhea, loperamide (the active ingredient in Imodium) is the only over-the-counter option generally considered safe, but only after the first trimester and for no more than 24 hours. Bismuth-based products like Pepto-Bismol are not recommended during pregnancy. When in doubt, ask your provider before taking anything.
Symptoms That Need Immediate Attention
Call your provider right away if you experience any of the following:
- Fever over 102°F, or any fever combined with body aches and unusual fatigue
- Bloody diarrhea or diarrhea lasting more than three days
- Vomiting so frequent you can’t keep liquids down
- Signs of dehydration: dark urine, dry mouth and lips, dizziness when standing, rapid heartbeat, or not urinating much
- Stiff neck, confusion, or trouble with balance (these can signal Listeria or another serious infection)
- Seizures
- Reduced fetal movement or anything that feels different about the baby’s activity
Severe dehydration may require IV fluids at the hospital. Don’t wait to see if it gets better on its own if you’re showing multiple signs from the list above.
Food Poisoning vs. Morning Sickness
It’s easy to confuse the two, especially in the first trimester when nausea and vomiting are already common. The key differences: morning sickness rarely involves fever, diarrhea, or muscle aches. It also tends to follow a pattern, often hitting hardest in the morning or in response to certain smells, and it develops gradually over days or weeks. Food poisoning comes on suddenly, usually within hours of eating something contaminated, and typically includes diarrhea alongside the nausea. If you have a fever or chills on top of your GI symptoms, that’s a strong signal you’re dealing with an infection rather than pregnancy nausea.
What Your Provider Will Do
When you call, your provider will ask about your symptoms, what you ate recently, and how far along you are. If they suspect a specific pathogen like Listeria, they’ll order a blood culture to confirm. For most routine food poisoning (the kind caused by common bacteria like E. coli or norovirus), the focus is on managing symptoms, watching for dehydration, and making sure the baby is doing well.
If a more serious infection is diagnosed or suspected, your provider may start fetal monitoring. This could include ultrasounds or non-stress tests to check on the baby’s heart rate and movement. There’s no single standardized monitoring protocol for this situation; your provider will tailor the plan based on how sick you are, what pathogen is involved, and how far along your pregnancy is.
Most women recover from food poisoning within a few days with no complications for the baby. The infections that cause real problems, especially Listeria, are relatively uncommon. But pregnancy is the one time when even a “mild” foodborne illness deserves a phone call to your provider, because catching a treatable infection early can make all the difference.
Preventing a Second Round
Once you’ve recovered, it’s worth tightening up your food safety habits for the rest of your pregnancy. The highest-risk foods for Listeria include deli meats, soft cheeses made with unpasteurized milk, smoked seafood, and pre-made salads from the refrigerated section. Heat deli meats until they’re steaming before eating them. For Toxoplasma, cook all meat to safe internal temperatures, wash produce thoroughly, and avoid handling cat litter if possible. Keep your fridge at 40°F or below, since Listeria is unusual among bacteria in that it can grow at refrigerator temperatures.