Help please!

I am 4months PP with my son. My period is VERY regular. It hoped RIGHT back on schedule with my old period schedule 4wks PP. not breastfeeding.

In July I experienced some very early pregnancy symptoms like I had with my son. I really thought I was pregnant And while we weren’t trying I was happy if I was. On the first day of my missed period I took 3 tests all negative (but not first morning pee. I know. Dumb.)

A week passed still no period. Still felt pregnant. I planned to test 7 days late but didn’t because my “period” started. But it wasn’t like my normal periods. I ignored it and blamed it on PP hormones.

But ever since then I have still felt off. Overly emotional. Diarrhea waking me in the middle of the night like I had with my son very early on. Cramps. Etc.

well according to my glo calendar based on my last “period” I had ovulation week last week and am 10 days away from next period.

This past Sunday I noticed some thick clear and brown and link mixed discharge every time I wiped I thought it was weird but forgot about it. Fast forward to last night. I went the bathroom and my panties were soaked with thick brown almost black discharge/blood with clumps in it as well as when I wiped. The word “miscarriage” instantly entered my mind. But I have 0 experience it’s miscarriages. So I don’t know. All I know is I have never had anything like this and it’s not like a weird period. It’s coming and going. Still some cramping. Thoughts?