Is it possible to conceive under these conditions?

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Of course its possible I really don’t think much is impossible in the way of pregnancy, but is it probable that I could conceive….?
I had unprotected sex and he didn’t pull out. I was on my period and I used a the baby center website to detect when I ovulate and it isn’t until the 18th. Therefore I was curious if its possible. I don’t think that I am pregnant because this occurred only yesterday, but I was just curious the probability of conceiving under such conditions.

sperm can live in you for two weeks so idk
My first pregnancy was conceived during "period" sex.
Predicting that your ovulation was on the 18th is based on the average cycle length and on the average luteul phase length of 14 days.
But, many women ovulate earlier and have a longer luteul phase.
So, it’s possible, but not as likely.