WARNING TMI

Hi ladies
THIS IS VERY GRAPHIC.  
I have my "period" but on day 2 this happened. Ususally i get a bad thick blood with small tissue like pieces. However I felt a massive gush and when i checked this was there. 
It scared the crap out of me. 
Is this normal? 
Im so paranoid that I could have beenpregnant  and had no idea and that this is a miscarriage. 
We have had so many problems ttc. 
I apologize for the graphic image i just didn't know what to do.