Is this mucus plug?

I'm 37 plus 3. Third pregnancy & today afternoon i think i just lose my mucus plug... Nothing happening now tho. Roughly when after you lose your mucus plug you start contractions?(especially mommies who is not first time i want to know) Should I standby my hospital bag? Lol suddenly very nervous! Not prepared. PS: what does mucus plug looks like? I might be wrong. First time losing mucus plug last 2 children didn't experience this before. Mine is like clear color to light green/yellow sticky like booger / snort. No blood tho.(pic included) TIA for helping out #pleasehelp #advicepls #pregnancy