Ate unpasteurized cheese while pregnant, now what

What does the evidence say about accidentally ate unpasteurized cheese during pregnancy?

1. Listeriosis symptoms, when they show up, can include diarrhea, fever, muscle pain, joint pain, headache, and a stiff neck, typically beginning days to weeks after eating contaminated food, and not everyone infected with Listeria develops symptoms at all. 1
2. Soft cheese carries more Listeria risk than hard or dried cheese because its higher moisture content allows more bacterial growth, but pasteurization brings that risk down to very small, and unpasteurized soft cheese that's been thoroughly heated before eating, like melted on a pizza or baked into a dish, also carries only minimal risk. 2
3. The incubation period for pregnancy-associated listeriosis runs unusually long, with a median of 27.5 days and a range of 17 to 67 days in one analysis of confirmed cases, so feeling completely fine for the first week or two doesn't rule out a later concern the way it would with a faster-acting stomach bug. 3
4. In a 20-year New Zealand surveillance study, listeriosis in pregnancy occurred in about 12.3 out of every 100,000 births, roughly 90% of cases were traced back to food, and maternal illness itself was usually described as mild. 4
5. Pregnant women face roughly 10 to 100 times the infection risk of the general population, which is why the warnings are so blunt, but in one cohort study behind that estimate, all of the mothers who developed listeriosis during pregnancy recovered afterward with no lasting complications. 5

Is accidentally ate unpasteurized cheese safe in each trimester?

• First trimester. This can happen at any point in pregnancy, and an accidental first-trimester slip carries the same low overall odds as any other timing. Listeriosis has an unusually long incubation window, so if you ate it early on, watch for fever, muscle aches, or flu-like symptoms over the following weeks, not just the next day or two.
• Second trimester. Documented listeriosis cases are actually less common in the second trimester than in the third, so an isolated exposure now doesn't carry extra concern. Keep an eye out for fever, chills, or body aches for several weeks after eating it, and mention the exposure at your next prenatal visit even if you feel fine.
• Third trimester. Reported listeriosis cases cluster more heavily in the third trimester than earlier in pregnancy, so this is the window where it's most worth paying attention to new fever, flu-like aches, or reduced fetal movement in the weeks after eating something risky. Call your provider promptly if any of those show up rather than waiting for a scheduled visit.