Implantation question

Eva
Okay so my period was due on the 5th. spotting since 11/3 I thought my period was here. I spotted not even a whipe of red on the day, then the next day red and ewcm so I thought again okay period is coming let me put in a tamp. Nope. Again the next day and it was brown spotting, ever since then it's been brown. I woke up the very first 2 days with horrible cramps I was freaking curled up like a baby when I woke up those days. I had slight cramps like that but they go away really quick ever since then. Both sides of the abdomen would also hurt suddenly and lower back pain like a uti, took a test came back negative. I don't want to waste tests on negatives!!! 😑😒 has anyone gone through this???? What is implantation like?! I'm not testing again until Friday!!!