Is it possible to get pregnant during the break (is it the first break)?

Good afternoon! I took the first Minesse card right. However, I had unprotected sex with my fiancé yesterday, the day of the last pill. I am worried because I have heard that the spermatozoon stays up to 48 hours in the body and that during the break (in the first card) it is possible to become pregnant. Being that I took the last pill yesterday and had sex without a condom, is it possible that I became pregnant during this break (remembering that it is the first break)? Thank you in advance!