Well, I would recommend birth control ofcourse and if you can't see a dr. for the pill then I would suggest that you get condoms, foam, or don't have sex.
SOme of the feelings you're feeling are pregnancy signs. However, I think alot of it is being read into because you're scared and thats 100% normal.- I used to do that too..
This is how it went for me... I started to get pains in my sides when I was 5 months pregnant because of the ligiments stretching, Then at three months I got the breast rings. The naps started in the second month. Same with morning sickness.. I mean I was throwing up all of the time. I started to feel bubbly fluttery, at 16 weeks. Didn't feel the baby till around 20 weeks...
Take it easy its possible, but I think you could be reading in to it.