Hard and sore nipples

🌻🍀Sunshine🌷🌸
AF is going on 4 days late. 6 HPT's all negative. My breasts but mostly my nipples hurt super bad and theyre rock hard! It started on the day of my missed period. I've been feeling somewhat nauseous but nothing too out of the ordinary. Also my tummy feels kind of...weird? Like its hungry but I'm not hungry lol please ANY thoughts or advice!