I'm not sure how old your wife is, but I will tell you oral wasn't one of my favorite things when I was younger, in my 20's. I felt very uncomfortable with it, not because of body image, it was just the act itself that was uncomfortable. I did learn to LOVE oral, so there is hope. I do think you should try to talk to your wife and ask her why she thinks she doesn't like it. If it's about body image, ask her if turning off the lights will help. And yes, while she's pregnant her hormones will be in an uproar, take advantage while you can.