Hi, its reasonable to raise your fears especially i your condition. Would love to know if you got any accompanying symptoms especially at the level of the abdomen. However, the fact that you are not bleeding is already reassuring. Amoxicilline and other Penicillines during pregnancy are relatively safe. Its true taking some antibiotics could cause other diseases especially at the gatsrointestinal tract. But to think that the oral thrush comes from Amoxicilline use, it really should be very rare. Oral thrush results from immunosuppression most of the time, with use of drugs such as corticosteroids. Pregnancy is a relative state of immune suppression. However, a reevaluation by your gynecologist could with worth taking. Just the best and , Regards, Luchuo, MD.