will taking Provera or Metformin have any effect on fetus?

Just a quick question I want to get out there...I have PCOS and for the past month I'm been taking 10mg of Provera for 10 days, then on cycle days 5-9 Clomid, 1500mg of Metformin, Prenantal & extra Folic Acid everyday. My question is this will taking my Provera or Metformin as prescribed have any effect on my fetus if I don't know I'm pregnant at the time? With my son I had to go in for a blood test to get a positive reading so I'm a bit scared about how to go about it this time once we do get pregnant. According to my OPK I didn't ovulate until cycle day 18 which would be the same day I start my Provera. I'm at a bit of a lost b/c there's no concrete information on the web about the dangers of taking these meds while pregnant. And since we all know the first couple weeks of a pregnancy are most crictical I'm just worried for the safety of my fetus. Any help would be greatly appreciated...Thanks so much in advance...