You can dye your hair when you're pregnant...particularly the 'low peroxide' temporary ones...maybe she just felt like matching her hubby...or as someone else said, going back to her roots.I think she looked a little stressed too....but I chalked that up to their trying to get preggers (remember she said it was more difficult than they imagined) she's probably a bit depressed that it's not happening faster...
Don't know if Ryan was bored or just uncomfortable...he was never really 'at home' in front of the camera and probably only did the revisit for her...
They seem like fairly decent folks...I wish them well...