Mucus Plug ? Please Help

My boyfriend and I were taking a shower and I just changed about 5 minuets ago well i've been hurting down there for about two weeks and when I was laying down my boyfriend said I had blood on my underwear he took a pic to show me ( I don't want to post it ) but I also wiped and there was a lil tiny bit of blood should I be concerned or is this my mucus plug ? 
I told him " well theres no mucus " and he said " but your underwear is sticky " 😁 
If it is my mucus plug , how long after you start loosing it will you go into labor ?