Hi Danielle, I had the same kind of thing in the last week of pregnancy with my DD and also during labour. I remember telling the Dr that my tummy just near my beblly button felt like it was tearing. It didn't and my VBAC went just fine. I have noticed two tiny little stretch marks on my tummy near my belly button so perhaps it was the skin tearing/stretching. If you are worried mention it to your OB/midwife.