unprotected sex

so my BF and I have unprotected sex regularly I'm on BC and have never had any pregnancy scares. I take it everyday at 11:03 give or take a minute. however this past weekend, which is my placebo pill week as I have my period my BF ejecaulated inside me twice. I'm on my last day of placebo pill. how likely is it that I'm pregnant ? and should I get plan b? I know on the pull you're not supposed to even ovulate but I'm nervous. it was an acicdent. please don't judge and help I'm old enough to have children I'd just rather not rn