I had knee surgery several weeks ago and just found out I am 4 weeks pregnant. I have been taking Percocet prescribed by the doctor. My ob appt isn't for 3 more weeks and although I have stopped taking the medications, will it affect my baby from the last 4 weeks of use?

We don't know how much you took. Generally I think you are OK, but you certainly should tell your doctor what you took and when.

I usually took 2 or 3 a day just depending on pain.

This maybe too much information. When I guesstimated time of conception because this was a complete surprise. It would have been 2 to 3 weeks ago.