I'm new to goats, but have been staring at my goats lady parts for a few months now, watching for changes. It seems that everything is puckered, tighter, and the tip of the vulva is pointed up when not pregnant. Everything loosens, including the anus, and tip points down as the pregnancy progresses. All vulvas are a bit different, so it's a good idea to document your doe to check for changes. Oh and it's easier to tell after 3 months.
I started using the screen name Mylie (pronounce like the singer/actress) when I was a teen (17+ yrs). It's actually a scramble of my sister's name, Emily. D stands for Delfrado, which was a made up last name my other sister and I would use during play. No lies involved. Lol. Though I do sometimes wonder how many people think I'm trying to say something.