TMI!! help

Ashleigh
Tmi photo in the comments since I can't make it TMI on my phone but what is this?? I'm almost 28 weeks and that's the 3rd chunk of whatever in the last hour, every time I go to the bathroom there's a clot of whatever in my underwear. Never had this before, but I'm almost 28 weeks pregnant. Was having infrequent contractions last night and now this?? Any ideas?