AF due 12/7 late!

I've taken two pregnancy tests and both came
Out negative. I don't feel like I'm about to start although my boobs hurt... Could my
Period just be late or could I be
Prego? I've just started tracking periods, this is our 3rd cycle trying.. Maybe I got my days mixed up? I'm not tired, or grouchy..bloated or anything. Lots of discharge and sore breasts. Anything would help! Thanks.