So my period is 8 days late but all the at homes I've taken are negative. I'm having nausea without vomiting, my breasts hurt especially if/when they are touched, my head constantly hurts, I'm gaining weight (have a small slight belly), i only want pizza or tacos/queso from taco bueno, I'm moody as hell (almost cried cuz my husband made a joke i didn't like), I'm exhausted so easily. Also my lower back hurts alot and I'm gassy, and i feel like there is pressure in my lower abdomen like I'm constantly full even though I'm always hungry. I have an appointment on the 27th, but just outta curiosity if I'm not pregnant what are some things that might be going on?? Asking so i can be prepared and do research on things that it might be

Update: It's basically midnight, Monday night, and I'm pretty sure I just got my period, but it's really watery (sorry for the TMI) is that normal or is that possibly implantation??