Sore boobs

So me and my bf are trying to conceive with our first. We had sex the day I ovulated which was on June 24th and he came inside me. That whole week i was cramping. Now a week later my boobs are really sore. I got home from eating dinner and took off my bra and as soon as I took it off my boobs felt so heavy and sore. It hurts when i touch them even when bf touches them and squeezes them..tmi sorry. Idk if this may be an early sign of pregnancy. Help!