Is this common??????
Answers: It's clearly normal to be a little stressed. :) But if you're seriously freaking out, that can tell you something.Your gut feeling is usually the best indicator of how you really get the impression about someting; maybe your not fairly ready (I wasn't until I was 21!) or possibly he's not the right guy to have sex with (there's alot of wrong guys out at hand! :p ). The best answer I can give you is that if it's the right thing to do, it'll discern right - and there will be GOOD butterflies in your stomach.
(PS, if you're not trying to go and get pregnant, it's probably a good idea to receive birth control before starting to have sex near someone, they you know you're 100% covered you know?).
it's just your nerves. if you nervous bout sex or anything its common to have a funny feeling contained by your stomach. just don't think bout it so much. relax and you'll discern better.