I know exactly how you feel, although mine isn't from pregnancy. I have had excess hair issues all my life due to PCOS. I shave my arms and side of face, probably should wax but can't handle the pain. Looking into lazer after Peanut is born.

As for the chin, I pluck mine cause I don't have lots of hairs there, but my mum waxes. I'm fairly sure she's never had any rashes or anything so I reckon you should be sweet