Mucus/Discharge? Help! (picture included, sorry)

So I am 15 weeks today with my second child, I've been loosing what honestly looks the same as my mucus plug. I've been told perviously that it's just likely discharge but that's without any checks etc and our local hospital isn't very good. With having a precious miscarage, any issue its a straight guess of "miscarage". 
Needless to say, I'm worried and wondering if anyone else has experienced this and what was it? 
I've never had any pervious issues or anything like this before pregnancy etc to.