Sometimes after my boyfriend and I have sex and I use the bathroom as I wipe myself sometimes there is a little bit of blood. Is this something I should be concerned with and what could it possibly be. Sometimes it hurst and I know I'm going to find some blood but usually it doesn't. I've been looking for anwers on-line but most of them are talking about a larger amount of blood. This is the first time this has ever happened with past partners I have never bleed even a little and thats why this concerns me now.