Bleeding After fingering??

My boyfriend and I have been together several months. The first part of our relationship we didn't have an issue. But the last 3 months, almost every time he fingers me I bleed! It's not any different than it was before. I don't bleed during sex...I have been having a super irregular period which I have an appt to talk to the obgyn but that's the only thing that's different and I'm not sure why I keep bleeding from this. I'm starting to get concerned thinking that there is a cyst or something crazy up in there that is just making it sensitive and susceptible to bleeding easily.