About 5 or 6 days ago i had unprotected intercourse. I was on birth control for about a year and a half and i only have a month and a half left. Trying to conserve; I didn't take my birth control for about 6 days prior to having sex. After he came inside me i found my birth control and i am taking it now. The day after and a few days added to that, I've been feeling nauseated, I've been sleeping 10 to 15 hours at a time, I feel sick to my stomach but not to the point of vomiting. The foods i used to love i dislike; such as chocolates and fries. I took a pregnancy test today and it came up the negative sign, but it was super faded. At first i saw a positive sign but then changed to a negative immediately. What could be wrong with me?