I am 18 years old female and ive been having unprotected sex with the same guy but we use lubricant and he always pulls out but lately for these past two weeks I've been feeling nauseous with smells, food and even being in the car. I've also had lower back pains and i can't lay down on my stomach any more. And if I go walking I feel I have to slow down in order to catch my breath. Also I've been a little gassy but haven't had any pains just a little bit pressure above my stomach but I think that's because my breast feel heavy and I don't know if I could be pregnant or if it's signs of something els but could any help me ?