My boyfriend and I had sex exactly 7 days ago(Monday April 4), unprotected. Some of his semen ejected into me. I take birth control pills, mines is Gildess. However I am on the antibiotic amoxcilin. I started the amoxcilin Saturday (April 2). I know this antibiotic can weaken the strength/effectiveness of my birth control. I have not taken a pregnacy test yet, I will in the morning. If I am pregnant, I know I am pass Plan B stage, so what steps could I take to prevent or stop the pregancy. Help!