Mucus Plug

I'm 35 weeks, almost 36. I have been having pains on and off for almost a week. Today I had thick snot looking stuff come out but I'm not hurting now. I'm thinking maybe that was my mucus plug but I feel better now than I have the past week. I still have pressure down there but no back pain and sharp pains. Thoughts? 
Personal stories; like what mucus plug looks like, how long until you were in labor after you lost it? I'm a first time mom so I don't know. 
Edit: is this what mucus plug looks like?