So, I've been reading more about it, especially since my doc's won't do an internal without a good reason. So I made DH check it tonight. Absolutely nothing. So then I "made" (as if it took a whole lot of effort) my DH do his husbandly duties. After going to the bathroom I realized my girly bits were quite swollen. So I asked DH, and he had a look and confirmed that they are definitely swollen. And then, he saw the purple line. About 2 cm, starting at the anus. I've had a couple random contractions since, but nothing serious... We are keeping an eye on that line though. It'll be interesting to see if it really is a good indicator.
By the way, there's a blizzard out there, and getting worse. We are supposed to get 40-60 mph winds and 10-15 inches of snow by tomorrow. Sounds like a great time to have a baby, no?