pains in stomache after having sex

okay me and my boyfriend had sex but it was un protected im 15 and hes 14 it lasted for like 7 minutes and he swares that he never released in me but anyways now i keep having these pains in my stomach and i keep seeing spots of blood here and there and now i feel like im going to throw up, and feel a little bit disy. and ive been really tired lately are girls supposed to feel this way after first loosing their virginity? or is it a sign that i may be pregnant? somebody help me please im so scared i hope i aint pregnant