Okay so last Saturday at 10 o'clock my boyfriend and I were having sex. He came inside me on purpose. Well the next day he bought me plan B one step pill. This was 18 hours later when I took it. I started my period on the 8th-14th. So it was 2 days later when he came inside me. Then Friday I was bleeding lightly, it's Sunday and I'm not bleeding anymore. So I bled for two days very light. What could that be?