Can shingles during pregnancy be harmful to the baby?

Doubt any effect: Shingles is essentially the emergence of a hibernating virus from nerve clusters along the inside of your spine. It travels out the nerve, like a canoe paddling down river to the skin, where pt causes pain & blisters that contain the reactivated virus. To affect baby it would need to enter the blood & pass thru the placenta. This is not a feature of shingles.