Is there much chance of me getting pregnant?

So we had our daughter in May and we are saying that we look at how everything is in a few months and see if we should try for another one.

Last night however we got a bit carried away and didn’t use protection, we’ve always said before that if it’s meant to be then it will, im curious about what are the chances that I actually get pregnant? Our last took 3 months or so.

My period has been a little off recently (a few days early)