miscarriage??

I started my period two days ago and i started with brown discharge like normal before i started birth control about a year ago. yesterday i had more brown discharge but it looked kinda like coffee grounds and was having cramps on my lower stomach bladder area and now today i have more brown discharge and light red blood. i don’t think i was pregnant but can someone please help me?

Update:

i took a test but it came out negative so i think i am just having a heavier period than normal