(Very TMI, pic in comments) I've been gradually losing my mucus plug since 30 weeks and it will have…

(Very TMI, pic in comments)

I've been gradually losing my mucus plug since 30 weeks and it will have been regenerating. I wiped this morning and got what's shown in the photo. It's the thickest it's been and is just a big lump. The colour is also a bit darker than usual. Could this mean it's all almost come away? Got a midwife appointment soon so hopefully they'll check if I ask them because had constant dull pain in my stomach and back over the past few days and had so much pressure down below I struggle to walk and move in general.