TMI!!!! But help needed!! If you're willing.

Sierra • Hi! My name is Sierra. & I`m a momma of a two year old girl (:
BF and i BD last night.  Also TTC and 10DPO AF due 8/29saturday
 I'm freaked out because this morning when I went to wipe I pulled this out of me!
Has anyone had anything like this? Know what it is ? 
What does it have to do with?