5weeks pp not sure if clots are because of pumping!

Hey ladies! So I’m 5weeks pp and I’ve been exclusively pumping since I brought my daughter home. I started pumping more often cause I had a small dip in my milk supply. I stopped bleeding around 2weeks pp. I would just have yellow discharge until about a week ago when I started bleeding again and it’s bright red. Today it’s been heavier and I passed 3 really big clots within the span of two hours. I’m not sure if it’s because I picked up the amount of times I pump so my uterus has been contracting. But I don’t know if this is cause for concern. I have huge HUGE anxiety with phone calls so I’m trying not to have to call my doctor. Any help is welcomed!