My boyfriend and I have had sex 4 times. We had sex unprotected on the 31st of October and my period was suppose to come on Tuesday. It's Thursday and no period or signs of it coming. I took a pregnancy test 5 days ago and it came up negative. I'm terrified and I told him and he said I wasn't pregnant since the test was negative but now my period is 3 days late. I have had symptoms like increased appetite, light abdominal cramps, back pain, very sore boobs and my nipples got darker. Help