Mucus plug for real this time?

Jesenia

I thought I had been losing peices of my mucus plug but today 38+5 I sneezed and there was a big green tinged snot like discharge with a little bit of brownish blood on it. Ive been uncomfortable with back pain and some tightening in my belly since then. Idk if this is gonna turn into something. I’ve been 3cm since my appointment Friday and last night I was having crazy lightening crotch and back pain for like 2 hours. Can anyone relate? Share your prelabor experiences please. My husband is 4-5 hrs away and I don’t want him to miss it but I don’t want it to be another false alarm.