first time...comdom failure...and withdrawal

I've been checking everywhere to make sure I'm not pregnant, I had sex for the first time few days ago, in all apps it says I'm not on my fertile days and my ovulation day has already passed, however, we had sex without protection but he pulled out, he got in again but he cleaned himself, I'm still worried, I've done tons of research and I don't want a baby right now. Although it says there is a low chance, how possible could it be for me to be pregnant?