I had unprotected sex with my boyfriend on February 11th and he came in me. On February 29th I took a pregnancy test and it came out negative. Later that day I started what I thought was my period but it was very light and only lasted 2 days and my normal periods usually last 7 days. About 2 weeks later I had a little bit of light brown discharge that lasted a few days. April 2nd I had unprotected sex again but I took plan B right after. April 7th I started having a lot of brown stuff come out that looked like what I usually get at the end of my period. This lasted until today. I look very bloated and my breasts have been sore for a few weeks. I also throw up every now and then at night. Could I be pregnant? Please help!!!