Hi, I'm 26 Years Old And Have Been Trying To

Hi,
I'm 26 years old and have been trying to conceive for about three years now. I've had PCOS since I was 17 and got to know that I'm hypothyroid a few years back. I am overweight and losing weight is getting very difficult for me because of thyroid imbalances. My periods are very irregular. I take thyroxine everyday, I've been taking duphaston to induce my period. And I also take Metformin. I also take iron, folic acid, vitamin b complex and evening primrose oil as supplements.
What I'd like to know is, do I have a chance of conceiving while taking duphaston? And my doc told me to take duphaston on the 16th day of my cycle, but what will happen if I conceive? Will duphaston make me bleed even if I conceive?