Help. Has this happened to you? TMI

I started spotting at cycle day 9, for the second month in a row, I was excited that it could have been implantation bleeding, and even though it started as a dark brown color, it’s now bright red and there’s way too much to be implantation bleeding.

I woke up this morning (cycle day 11) with horrible cramps and just passed this. It’s very hard and dense. Followed by a large amount of bright red blood. What is this? Has this happened to you? My cramps decreased almost immediately after passing this.

Some background, I had a miscarriage at 13 weeks back in September. I had a normal period in October, but November and December have been very strange for me. Longer than usual, pink mucus in between, and now this.