FREAKING OUt

so I started my period last Tuesday and had sex Saturday night and my boyfriend came in me when I was still slightly bleeding, but since then my period stopped. He came in and I was on the sugar pills. I take my pills perfectly with the exception of taking one or two a couple minutes off. I’m freaking out I cannot he pregnant right now. Should I trust my birth control even tho I was on the sugar pills or can I still take a plan b? I keep reading about girls getting pregnant on birth control or their period and I’m freaking out.