In need of some advice. I had unprotected sex with my boyfriend two weeks ago. The night before last I woke up at 5 a.m because my nipples were burning really bad. My left nipple was burning for an hour and a half the right only lasts for 30 mins or so. That whole day my boobs were sore. Yesterday I was able to sleep and my boobs didnt hurt. Today they are sensitive. Especially my nipples. They are not swollen and i have not gotten bigger. Could I be pregnant? I took a test and it came back negative. Any advice?