Actually when I got my BFP with my son, my breasts didn't hurt and they usually did starting about a week before AF. So you never know, it could be a good sign

(Now since I had him, my boobs don't hurt at all before AF and it doesn't mean anything).
I didn't have very many signs before I got my BFP. The main one was my boobs not hurting, and my post-O temps were much higher overall than usual. But I didn't feel very different, I actually was kind of crampy and was sure AF was coming. PMS and early pregnancy symptoms can be very similar, unfortunately.