I would see your doctor asap for a couple of reasons.
1) piece of mind - set you mind at ease that it is most likely not a big deal. (is it bleeding due to tearing or are we talking period blood?)
2) it may be something that if caught early enough, it won't be a big deal. - not to freak you out, but I had something similar happen and I am going through tesing for endometriosis right now.
Let me know what you find out, because I am right there with you. It's traumatized me so much that I have not had sex since october. Fortunately, I am not with anyone right now, so the suffereing is only my own. :)