Pms or pregnancy

Usually when I'm pmsing my boobs will hurt extremely bad and they're so heavy. (Like a painful heavy) Sometimes I have to sleep with a bra on. This is our first month ttc and my boobs just feel different than that. They almost hurt in a different way? It's hard to explain. They don't hurt as bad when I'm pmsing. They hurt on the sides like I have a bruise there and just my nipples are tender and sensitive. They also just feel heavy but not painfully heavy like pms. So idk if I am just pmsing or this could be it! I'm 10dpo today and have not tested. Every other time I have tested it has been negative.