Well both Prue's in both time era's in my stories have been pregnant twice. Both of them didn't know what to do when they were pregnant the first time with a magical daughter. Prue ask her Grams for help. When both Prue's became pregnant the 2nd time they both knew what they were doing.
Evil Paige was pregnant the first time her sister was too with her daughter so it was hard on their Grams trying to keep as many demons away from them as possible. They both couldn't handle them the same by being pregnant. Their powers were everywhere.
Its great that Prue in your story is going to ask her mum about being pregnant.