I'm freakin my gurl might be pregnant.?

she had her period maybe 2 weeks ago and we had mayb 2 times after her period to now. she eats unhealthy and she gets stressed out real easy from our 2 daughters. i think she might be stressin or constipated or something because when she is constipated her stomache hurts and she feels sick. and that is the only thing she is felling first her stomache and then she felt sick. but im still worried im just trying to get some out side views.