i keep bleeding during sex!?

i recently started dating someone new and we get along ridiculously well. the only thing is that sex is a bit uncomfortable - i'm not sure if he keeps hitting my cervix or something. i'll spot during sex and we'll have to stop to clean up his sheets and it's so embarrassing. sex has never been painful or uncomfortable for me in the past and i've never bled until now (besides my first time) so i'm quite concerned about what's going on.