Is heavy bleeding 3 weeks postpartum normal?

Idk if I’d actually say normal. But I was just breastfeeding my daughter when at the end I noticed it felt like I kept peeing myself. I looked down and there was blood everywhere... all over my sheets. I ran to the bathroom and my underwear and pad were covered (I’m wearing a light weight pad because my bleeding has been very light) when I peed I passed a clot that was bigger than they have been, but definitely not plum size or anything like that.. after I passed it my bleeding has basically gone back to normal. My doctors office opens in 2 hours but I’m not sure what to do. Is this cause for concern?