I'm 21, my period started today (which was the normal timing) but I noticed a grayish bloody chunk on the applicator of my tampon when it was removed. I've never experienced anything like this before, but I did experience a fluttering sensation in my pelvic area (Almost like butterflies?) a few days ago as well. I also saw a white fluffy tissue looking piece of something after I urinated a few days ago as well, I thought it was just something that had been in the toilet but could it have come from me? Was this a miscarriage, or a sign of something like endomitriosis? I have a doctor's appointment tomorrow but I'm panicked.