Might be TMI

Okay so I'm 15 weeks pregnant and the past 3 times me and my husband have had sex I go to the bathroom and there's a little blood. Now I know light spotting after sex is normal but I did a check (won't go into detail) but it isn't coming from my vagina is behind it. Has this happened to anybody else? I don't know what's going on. In the beginning of sex I'll feel a slight sharp pain there but I have no idea what it is or why it's bleeding.