I'm 20 years old. I had unprotected sex a day after my normal four day period. Close to 20hrs later I took the morning after pill. Only a few days later I had a light period for about two or so days. A week and a half after I had unprotected sex I made a dr. appointment and they did a urine pregnancy test, which came back negative. Yesterday would be three weeks since I had sex. I have nauseous feelings (not to strong) that comes and goes mostly after I eat, but no vomiting. Then yesterday I noticed that my nipples were getting sore, and always erect. My lower back also hurts at random times and yesterday I started feeling light cramps in my stomach that come and go. Is there any way the drs' pregnancy test was to early to tell and I could still be pregnant? Or are they pretty spot on? My next period is due on the 21st of this month. Even though I took the morning after pill I catch myself getting a little excited... I don't want to cause myself to have symptoms. Any advice would be great!!