Pregnancy after vasectomy

Hey girls. Me and my bf have been together almost 4 years. I have a 7 yr old son and he has 2 older children. He was previously married and was encouraged by his ex wife to have vasectomy approx 18months before me and him got into a relationship. For the past 6 months iv really become majorly broody to the point where i would absolutely love to get pregnant. He on the other hand isnt too sure especiallt when it comes to paying out money and having to get a vasectomy reversal. Just wondering is there any women on here in the same situation as me or anyone that has conceived successfully years aftet vasectomy. Thanks in advance xxx