4 weeks pp still bleeding?

Michaela • I'm 25, Married, PCOS, Two angle babies, Delivered our twins 7/25/17 at 24 weeks and they are perfect 💙💙

I'm 2 days shy of 4 weeks pp and every now and then I get a good size amount of red blood. Is this normal? I can go a whole day with nothing but spotting when I wipe and then bam red blood.