You are your sister are in my thoughts, @annmarie2- wishing her a safe pregnancy! Like Amethyst said, you’ve got some sage advice from Silverbear and Phoenix. Adding to their suggestions, Garnet has a lovely Blessing for a Mother and Unborn Babe you could use- no ingredients necessary.
If you’re still on the hunt for Protective Spellwork, there is the Protection Spells Collection you could explore, or the many entries for all types of protective magick shared in the Protection Challenge Thread.
Sending love and light your way! 
