All right, so this all started about a week ago when I started showing some odd symptoms. My abdomen feels hard as a rock and slightly pushed out, I've suddenly grown out of all my bras, and there's been on and off nausea. I'm not on birth control, so I thought that even though we've always used a condom, there was a possibility of pregnancy. I took one test that came out positive, and 3 more that were negative. I went to see my doctor and as I was talking to her, my period began and I didn't get a blood test done. However, with the ending of my periods, none of these other things have gone away. Is there any possibility that I may still be pregnant?