Possible pregnancy/miscarriage, maybe?

Okay so, my cycle was supposed to start about 5 or 6 days ago and it never did. It was very late and my periods are spot on when they come. I took an at home pregnancy test and it came up negative, but I still didn't feel right. A day later, I started to spot and it's brownish red (sorry for the tmi) and I'm confused because it never looks like that unless my cycles are about to end. Yesterday I went to work and there was a lot of blood and I do mean a lot. I bleed heavy in my cycles anyways, but this blood was everywhere and it ended up ruining my clothes😓 I've heard of that being a miscarriage or implantation blood and I don't even know if it's either tbh, but I've been feeling funny, can't really eat and if I do it's small amounts, my breasts are very tender and sore, I'm nauseous to the point where I just want to vomit everywhere and sometimes I can barely stand (like now) my migraines are 10x more crucial than normal, I'm always fatigued or can barely sleep. I have diarrhea (sorry for the tmi again) I can't really drink anything, but water. My nose is very sensitive to any food I come across and just the smell alone makes me wanna puke. I'm just worried and wondered if anyone out there can give me any insight on what this could be? I've never experience these symptoms before and I'm a nervous wreck and scared as hell.