Missing 3 days

So I missed 3 days of BC because I couldn’t get my refills on time . I usually take them Sunday but I couldn’t get my pills till Tuesday . So Tuesday I had unprotected sex and than took my BC and a plan B because I was worried . Now today is Thursday and we had unprotected sex today and I’ve been taking BC for 6 months everyday at the same time and this the first slip up .I’m worried I could get pregnant ... is there a possibility that I could get pregnant ?