Is it possible to be pregnant?

Well i got married almost 2 months ago, and since then of course we have been sexually active due to the fact that we are newlyweds, anyways when we do sleep together he cu*ms inside of me. its not like im planning to be pregnant ill just be happy if i have it, well anyways ive been taking pregnancy tests since and they have all been coming out negative. but the problem is that i have been getting all the symptoms like sore and tender breasts, missed period, backache, headache, cravings, nausea, frequent urination, and being moody, so today i went to the doctor they took a urine sample and checked if i was pregnant and its turned out negative, so i was wondering why do i feel this way if i am not pregnant? or am i pregnant but it can be too early to tell? i was supposed to get my period on the 8th so i kinda missed it. i just want to know is it possible that the doctors test is wrong?