Here is a practical reading timeline that most parents find manageable:
First trimester: Start with Expecting Better or the Mayo Clinic Guide. Get the big picture on what is happening in your body and how to think about the decisions ahead. This is also a great time to start a pregnancy journal to capture your thoughts as you read.
Second trimester: Add a birth preparation book — Ina May for natural birth enthusiasts, or the labor chapters in What to Expect for a more traditional approach. If your partner wants to read one book, The Expectant Father is designed specifically for them.
Third trimester: Focus on practical postpartum books. The Happiest Baby on the Block teaches you how to soothe a newborn (you will use the 5 S's daily). Precious Little Sleep covers infant sleep in a funny, honest way that makes you feel less alone. And Heading Home with Your Newborn covers the basics of those first weeks.
You do not need to finish every book cover to cover. Reading the relevant chapters for your current stage of pregnancy is a perfectly valid approach. The goal is to feel informed and confident, not overwhelmed.