I had unproteted sex on the last day of my period which was Jan. 9th. Took plan b pill jan. 10. and began to have a heavy bleed a week later. sometime after that week me and my bf had sex again but he was more than sure he didnt get anything in me. it is now Feb.10 and i am 6 days late and today i experienced cramps with little brown and red discharge. Ive taken to tests and both have been negative!!! i need help please!!could i be expecting?