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According to my doctor, 4 hours. You can switch them up. Take acetaminophen, (Tylenol), then wait 4 hours and take Ibuprofen, wait another 4 hours and take acetaminophen and so on. :) 15 people found this useful.
If you have pain during pregnancy, you may take Tylenol or acetaminophen up to 2 tablets or 650 mg every 4 hours. Do not take aspirin during your pregnancy unless instructed to do so by your physician. Aspirin may cause problems with blood clotting and cause other problems during labor and delivery. Do not take ibuprofen (Advil) unless instructed by your physician, especially in the last 3 months of your pregnancy. If a headache persists for more than 24 hours, you should call your physician.