You can't go off of symptoms to know if you are pregnant or not. The only way to know if you are pregnant is to take a home pregnancy test(found at any convenience store) or by a blood test done at your doctors office. The bleeding might be from irritation from when you had sex or it can be some type of infection or std. You do want to make an appointment with your doctor no matter what though, since you are now sexually active. You'll need to start having a yearly Pap smear done, to make sure you stay healthy.
That can sometimes happen to first timers. Although you should take a test just to be sure. Also did you tell a parent about it? You probly should even if they told you not to do it it's always best to tell them anyways,
I've never heard of that being a symptom of pregnancy, but it may be some kind of obscure STD. You'll probably have to end up seeing your doctor no matter what it is.