Wtf is this should I be worried?

Backstory I missed my last period but I took 6 test and they were all negative and then i started my period on Tuesday last week and everything is fine no more pain than usual the only difference I noticed is that my period started really dark and light almost like spotting and it was brown/black and looked sticky and I’m usually very heavy and red in color but then saturday I was about go in the shower and this plopped out of me and I freaked out and my period started being more normal just heavy and red and my mom and friends all said I should go to the hospital or doctor and I texted my gyno but haven’t heard back yet 😭

Update: my gyno was taking too long to respond so I asked the doctor I work for what she thought it might be and she told me that it looked like a spontaneous abortion (miscarriage) but it could also be tissue she told me to wait on my gyno for further confirmation and request a beta hcg test

My gyno finally got back to me and was like it’s a decidual cast but then I told her i missed my last period and she ordered a test for me at the lab and I just got the results they were positive

Honestly don’t know how to feel rn. I’m kinda relieved cause i’m in no place to be having kids as a 21 year old. but also a little sad ig now that the shock has died. but things happen for a reason ig. my gyno made an appointment for me tmr so i’ll be following up w her and asking if i should be worried about any future fertility issues.