Pinching sensation around belly button?

Yola
Hey girls! Im 25 wks, with a big belly, i have been experiencing this superficial pinching pain on the left side of my belly button, im wondering is it muscle/ligaments that are stretching or is it strech marks that are about to come out? I mean do stretch marks hurt when they are about to come out??? I have 2 stretch marks on the right side of my navel from my previos pregnancy, im not super concerned about getting more, the pain just bothers me and i wonder what is it??? Anyone???? 
At least let me know if stretch marks gave you any discomfort on the skin when you first got them. Thank you!!

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