Pill and plan b

I’m on the pill and on Valentine’s Day I had sex with my boyfriend and he came in me. We went and got a plan b because I was extremely paranoid. Today I’m supposed to get my period but it hasn’t come and I’m having discharge that looks like ovulation discharge. Could the plan b be causing the delay?

Update: I have started bleeding but I’m not sure if it’s my period or implantation because I don’t really have cramps...