pregnancy??

hi ladies. so i had unprotected sex with my bf during my ovulation week and he did not pull all the way out so majority of his sperm got inside of me. my period is now late and i have been experiencing backaches, mood swings, some nausea, but i figured it was pms at first. now i am experiencing cramps so i thought i was coming on but i was not. i have noticed spotting & pink discharge which has never happened to me. i took 2 pregnancy tests, one was negative and the 2nd had a very very faint line. should i wait it out or take another test or should i just go to the doctor to get accurate results??