Thank you to everyone who shared resources on this thread! I was looking around for blogs to share with my pregnant friend, and I came across
The Parenting Co. They have a lot of informative posts about pregnancy and parenting! I think it'd be really helpful, and it's not just for first-time parents. They have stuff about appropriate beds, traveling with your baby, bedtime, pets with children, etc. I remember linking the blog to my friend because they also had a week by week guide for pregnancy.