Me and my boyfriend had unprotected sex and he cummed in me and I was ovulating. I took Plan B right after and I got my period early and it was light but longer. And last time we had sex I was somewhat bleeding. I was 16 when I took Plan B. Can that affect me?
Your question on whether Plan B may be a cause of concern due to your age, 16. If your question is about future fertility, no, that is not a problem. My concern is that you may be continuing to have unprotected sex. The fact that you were bleeding during your most recent sexual intercourse does not protect you from pregnancy.
I would strongly recommend that you visit a health care provider for assistance with ongoing birth control. Plan B is most effective when taken within 72 hours of unprotected intercourse, but it is not 100% effective. It is important to begin a more reliable form of birth control, which should include condoms, as you also need protection against Sexually Transmitted Infections. I would also recommend STI screening for you and your partner.