Chance of pregnancy?

I'm pretty sure I ovulated either 2 days ago or yesterday. (I use cm testing and previous cycles for reference) Last night my partner and I had unprotected sex in the middle of the night. We were both essentially sleepwalking so we forgot a condom.

It's not a huge deal, since we've decided we're not going to strongly prevent anymore and see where it leads since we don't have sex often anyway, but I'm wondering if there's actually a large chance I could get pregnant. This is the first time we haven't been careful close to my ovulation date.