dont worrie i feel the same way sometime too, but mine are all in my head. so that is probably what it is. go check it out thats the best i can tell you

it happened to you too? your period was about 3 weeks early, stomach felt weird, nothing happened? cuz i've been prayin to god like every second of the day that it's all in my head.

If you've had a period since having sex, there is no way that you can be pregnant. Periods cleanse your body of all that lines the uterus and any sperm remaining is washed out with it.

Troubles with your stomach may be anxiety, and probably are since it seems that you are stressed and pretty worried that you may be pregnant. Just try to be more careful. Sex which is considered "safe" is not 100 percent guaranteed safe.