Hey
Well I had the same thing last year. I forgot to take my pill, the condom ripped and I was worried sick. Then all of a sudden I started feeling sick every morning, I completely missed my period one time and I was freaking out (I already had one kid and didn't want another). But truthfully I think the symptoms came BECAUSE I was worrying so much. Our mind is strong and if we believe something, it can mess with our body.
If I were you I wouldn't worry too much until you take a pregnancy test, or take like 3 to make sure. I took 2 just to be safe.
Wish you all the luck in the world;)
Sarah