pill without condoms

me and my boyfriend had sex without a condom for the first time this past friday as i’ve been on the pill for over a year. i missed one pill this month and took a few late. he did not cum in me. what are the chances of getting pregnant on the pill with precum? i feel as though the hormone has been in my system long enough that i should be covered but just wondering if anyone’s had a similar situation. i am also expecting my period this week so even if i did ovulate it was most likely not that day.