first time this has happened

sa

I don't start AF until 10 days but I keep cramping and urinating alot I rarely cramp until few days before I'm expecting to start. also tmi but but my boobs feel very heavy and tender also I'm super hungry...I'm technically 4dpo today but I wonder if I'm pregnant I am trying to conceive so hopefully this is my month... could this be pregnancy symptoms and has anyone else cramped way before AF due?