Period/implantation question

I was wondering if anyone has dealt with a period that is just brown blood? There’s no pink or red whatsoever, it’s only brown, with a few clots here and there that are also brown, and no blood in the toilet when I pee. I’m on day 3, and I’ve had 0 cramps, which normally I have really bad cramps when in my period. And it’s more than spotting would be, but it took 2 and a half days for one pad to be even sort of full. I am so confused! Help!