What are the chances of getting someone pregnant after a vasectomy?

The percentages are low, but it's not unheard of. If the doctor didn't do his job correctly then it can happen. I've heard about several women who have gotten pregnant after their husband has had a vasectomy. You can go to your doctor and be checked out and they'll know if the vasectomy took or not. Typically the doctor does a sperm count a week after the vasectomy and a month after that to insure that everything is were it should be. And should probably be checked every few years after that.