sex off the pill?

Ch
so im on the combined pill, Rigevidon (21 days on, 7 days off - which is when i have my period). well, i took my last pill Sunday... my period hasnt started yet, due yesterday/today. yesterday and this morning me and my fiancé had unprotected sex twice and he came inside me both times (we normally do it like that but im usually covered by the pill). i dont always take my pill on time so i know that makes it less protected already... but what is the probability of me being pregnant??