Hello, I Was Curious About Whether I Need Emergency Contraception.

Hello, I was curious about whether I need emergency contraception. I had taken birth control consistently same time everyday for 2 weeks, had my period week, then two days after my period ended had sex unprotected. I hadn't taken my birth control that day until 1 when I normally take it at 10. So I was worried if I needed plan b, I had sex again the next day and decided my anxiety was worrying me so I took plan b even though I hadn't missed birth control pills. I had sex again 2 days after I took plan b unprotected but had still been taking birth control. Does plan b affect birth control after you take it, do I need plan b again or am I safe since I never missed a pill and had taken it before the last occurrence?