My OB wants to treat my Trichomonas with an antibio (it's called Metronizadole or Flagyl). I am very nervous about taking anything while pg, especially an antibio. The OB said everything would be fine, and that it wouldn't hurt the baby. I also found out that if I don't treat the infxn, that it could cause preterm labor, or low birth weight. I am 13 wks, so a little past my 1st trimester. What should I do? Anyone else had to take that while pg??