Mrs. Rivky Boyarsky, RN and Mrs. Mushky Kotlarsky Regarding a woman not going to a cemetery, during pregnancy:This custom is based on Emunah in Binyan Beis Hamikdosh, based on that which is mentioned in Gemara about certain families who raised their children in a way that they were careful to avoid becoming tumah so they would be able to be the ones to draw water and bring it to the Beis Hamikdosh.