Jewish prayer for person pregnant after miscarriage?

We have a lovely friend and his wife who are pregnant again after a long journey of infertility and many miscarriages. They are such awesome people and I know that the first trimester is a very stressful time for them. I’m wanting to pray for them to have a safe and healthy pregnancy. I obviously won’t be telling them I’m praying for them, but I want to do something. We are all Jewish but I’m reform and I was wondering if there are any specific prayers to do with this circumstance or to do with infertility in general. Thanks!