I am 2 months late but negative pregnancy test today i had a brown discharge but dont know wat it is

hey i had some questions . I have been late on my period 2 months and i have took 3 home pregnancy test and were all negative iv had some symptoms like peeing more,metallic taste, my back has hurt on and off, my breast are sore got stretch marks on them which i didnt have, i get tired a lot, eat a lot, iv gained weight in the past 2 months....today i noticed when i urinated i wiped and noticed a light brown discharge im not sure what it is and im not sure if im pregnant or not can anyone please give me some advice or answers i would appreciate it very much thanks.

And i am known to be irregular on my period i also had a cyst but i took medicine and the  doctor told me they had gone away he also told me thats what made me irregular but this was like 4 years ago. please if anyone has some answers let me know im desperate for some advice on what i might have or if im pregnant thanks once again.