I need to help him, but I dunno what to do

So my bf and I have been dating for almost a year, and just a week ago I found out I am about a month pregnant. This is an unplanned baby, and even tho I am excited (I've always wanted children) he is pretty scared and unsure. Which is understandable. My mom says I should wait till after the first trimester to give him some time to accept it, and I'm doing that. But what about after that? I would really like some advice to help him out, this isn't an easy thing to accept, so anything I could do to help would be wonderful.

TL;DR - this unplanned pregnancy has my boyfriend freaked out and I'd like to know what would help him ease into this.