Experience with mucus plug

Im 35 weeks so still have a little while to go but today a friend of mine who is due said shes lost her mucus plug and sent me a picture of it now I'm confused because the picture she sent me looks just like the discharge iv been having for weeks! I get big lumps of white/yellow booger looking mucus all the time so how would i know if it was my plug or not? Could someone please explain what its supposed to look like and how its different from normal discharge?