My period was February 4-8. My boyfriend and I had unprotected sex on the 10th and 11th. I took the morning after pill on the 11th. I weigh 199 pounds. On the 18th and 19th I am having very light bleeding. It's dark brown and started off as brown mucous. It's really light. My period isn't due until March 4th (13 days from now). Can I be pregnant ?