I have recently began engaging in outercourse with my boyfriend - I have never engaged in oral sex or intercourse. Twice now, I have bleed after he put his finger in my vagina. I assumed it was my period and used a tampon right after. Bleeding stopped pretty quickly and was very light. Both these times it was just a couple days before my period and I also have had a history of mono coming back, which has caused changes in my cycle in the past (one of these times happened 1 day before a relapse). This does not occur every time we do this. How concerned should I be and at what point should I see my doctor?