I havent had any pregnacy symptoms but i think i mite be pre

OK My boyfriend and I had unprotected sex, and he cam in me this have happen about four times and i dont come on my period until the 16. My bladder have been hurting me a little and i have been useing the restroom a lot but i was thinking i just had a bladder infection. My stomach will be big 1 day and small the next day, this is confusing me a whole lot. my nipples are a lil dark but my breast havent enlarge. if i am pregnant i am about a month. Thank You I hope u can help me

Hi there...Have you taken a pregnancy test?? If you havent then I would suggest taking one, you can find them at any drugstore, and there are some that you can take up to 4 days before your expected period...If it come up a neg.. then I would suggest going to a doctor, something else may be going on.....Wish you Luck....