Pregnancy after a vasectomy?

My partner had a vasectomy over two years ago when he and his wife thought they didn’t want anymore children. (They’ve been separated nearly a year and a half, and he’s purchased his own home that he lives in with me. No, I’m not the reason for the separation) I removed my Mirena 2 months ago, and this will be the first cycle that I’m trying. I so badly want conceive. Have any of you heard of women becoming pregnant after their partners had a vasectomy?