TTC Question

I have been TTC baby #1 for a year now. But here recently my boobs will ache SO bad. I'm about 16-17 days away from my period and I never experience aching like this in my breasts so many days from starting my period. I've been craving chocolate and eating it like CRAZY even though i don't like chocolate. I'm having pains in my side and also my stomach is hard. Anybody know what is going on? I need opinions & help!