about a month ago I had unprotected sex, he ejaculated inside of me so about 10 hours later I got plan b and took it. About a week later I started bleeding, it was kinda light and was a mixture of brown discharge. I've had sex about 2 times after taking plan b but we used a condom and I even saw the sperm inside the condom when he took it off so I knew it didn't get inside of me. I was supposed to start my period about a week ago and I haven't started. My boobs are really tender and my stomach is kinda sore. Should I be worried?