Postpartum bleeding/Has anyone dealt with random spotting ones it was 6 or 7 weeks after birth?

It’s been 7 weeks since I’ve given birth. My bleeding the first 3 weeks was a normal period amount of bleeding. After the little by little my bleeding got less. It was to a point there was some days I wouldn’t bleed. I would just have this yellowish brown blood but very little amount. Almost like if it was a last period days amount and color. There was days where I would bleed but recently I notice brown reddish blood and it’s randomly. It doesn’t always happen. Has anyone dealt who random small amounts here and there bleeding? This was from yesterday. I completely thought bleeding was finished already. Why am I bleeding yesterday if I thought my bleeding was finished?