Difference Between Boob pain

Sarah • Wife 💍 Mom to 3 fur babies 🐾 Trying to conceive since June 2014. Starting the adoption journey 🌍

What's the difference between noon pain before your period and a symptom for pregnancy? I get the worst boob pain before my period starts and it makes me think I'm pregnant, but I'm not. My husband and I have been trying almost 4 years, and we were hoping this would be the month! But my boobs are starting to hurt which is making me think my period is gonna start any day now. (it's supposed to start in 3 days) Is pregnancy boob pain mostly later on?