SOS - clarithromycin and 20 weeks pregnant..... Hi, i am on my 20th week pregnant and had 103 fever that wouldn t go down. My gynecologist prescribed clarithromycin and after a day i was without fever told me to stop it. I took all in all 3 pills of 500 mg clarithromycin. But i just read on FDA that clarithromycin is suspected of side effects in embryos. I asked my gynecologist and he said he had prescribed it before to pregnant women and there was no problem to the baby. But still i am scared. The only positive thing i can think to make me feel better, is that i took only pills. In your knowledge do pills of clarithromycin and antibiotics in general affect the baby during the 20th week of pregnancy?