So on sunday I had sex with my boyfriend sometime around midnight, and he came inside me. I have been taking birth control, and I am on my last week for my first month. I've only been on birth control once before and it was about 3 years ago. I had sex last night also and today when I used the restroom I was bleeding. I'm not sure if it is because I had sex last night but I wanted to get plan b just to be sure, but idk how that would affect my birth control......can anyone help please