I am currently pregnant and i used to do heroin two years before i got clean. will this affect my baby or what are the chance of her being born without a birth defect?

Some basics: It is great you are clean & none of that drug would effect the baby now. We are not sure what the effects would have on your eggs, but most exposed to H in pregnancy do not have defects. Every pregnancy has a baseline risk of about 4% of some unexpected outcome. That includes prematurity/illness/unexpected defect, but this applies to anyone. Keep up the good work & things should be fine.