EDIT! What are the chances of being pregnant?

What are the chances of being pregnant when your almost 4 months post partum and had sex? At the beginning it was no condom but then he put one on and finished with it on. Also it was during my fertility window.

Edit: the sex was about 2 days ago and today. I also am not sure if I'm about to start my period but I started spotting today long after sex.