What's the possibility?

Terra • After 5 years of trying and 2 miscarriages we finally have our little rainbow Evilyn born 10/07/19
Ok so by numerous apps my period is supposed to come on Sat but we had sex both Sunday and Monday. I know it's a super small chance but is there a possibility I could get pregnant? I have a feeling I'm not but it's the first time I've seen my husband since the first week of Jan so I was hopeful.