answer:I think there’s something like a 0.3% chance of it failing you. And as far as I know there’s never been any documented case of a fetus been harmed in that .3%. You’re wise to consult your doctor, but I don’t think you’ve anything to worry about however. I can’t remember for the life of me remember where I heard the 0.3 from, but I know it’s right. I’ll see if I can find it out for you though. brb EDIT: Yeah, for perfect use the risk of it not working are 0.3% for perfect use, and 3% for typical use. Good odds to my mind. As far as the fetus being harmed, the only problem is for women who are exposed to it during pregnancy, possibly resulting in low birth weight of the newborn. So from my understanding if you don’t have it injected after conception, all should be well, sunny and rosy with the world. Wikipedia have quite a decent account of this. Good luck at the docs, tell him/her I said hi.