Weird Change??

Hello! I’m a bit worried about my withdrawal blessings. I didn’t have a period my last pack, I only had brown discharge for several days during placebo week. For this pack, I had lots of tissue coming out and very slight bleeding but not much of a flow. It definitely was red but much less flow as it used to be in previous packs. This worries me. Please let me know if anyone knows anything about it or had similar experience and what it turned out to be :)