Miscarriage??? I don't even know

Im 18 and so is my Boyfriend/Unofficial Fiancé. Ok there is gonna be some TMI but i need help. So I'm basically new to this whole sex thing and so is he so the first few times we didn't use any protection other than i was pretty sure that i wasn't ovulating (because this app is great) and pull out (agin we are new to this so idk) so we were unprotected about five days before i was ovulating and the day after on the 3rd those are really the only times im worried about. fast forward to this Saturday night we tried having sex (protected mind you) but something felt very wrong so we didn't finish. Once i got home i just thought i had to pee but there was alot of blood and it was very painful, almost every time i go to the bathroom after has also hurt but much less and next to no blood. His best friends girlfriend went through something very similar basically the day before me or something like that and she i think is sure that it was a miscarriage i don't know how though. But im getting all of that info like fourth hand so i dont know if i should assume i had one as well. I plan to take a pregnancy test as soon as possible but im thinking i should go to a Gynecologist because i have no idea what is happening to me. Please help!