bleeding and freaking out

So the last 3 times my boyfriend and I had sex I bled enough to make him need a shower (it was bright red and so humiliating). He's not small but he's not titanic either and I don't think he's hurting me (I don't feel pain during) and I'm still only 33. I'm terrified to go to the doctor, what if something is wrong? I will be devastated if I have to have a hysterectomy like my adopted mother. I have zero info about my biological mother's past so I don't know if I should be particularly worried about anything crazy and I had a pap a few months ago that was fine. I want to have more kids in my future (I have a 12 year old son)! I shouldn't start my period for about a week from tomorrow. 
What should I do?