There's nothing wrong with it. A lot of people like porn and everyone has their personal preference when it comes to type. Some people do find pregnant women very attractive and "hot".
Part of it can also be that he can't wait to see what you'll look like when pregnant and likes to fantasize about you, the porn may help fuel his imagination.
I myself am straight, but I too think pregnant women are extremely sexy and downright gorgeous. My husband thinks so too, and when my time comes (we're TTC too) I know that just looking at my pregnant body with his child growing inside me is going to get him VERY excited all the time lol.
I think everything is fine for you guys, maybe talk to him, look at some with him, ask him what he likes about them, how he thinks you'll look when you conceive etc. Instead of being freaked out by it, use it as a bonding opportunity for the two of you.
Good luck ttc.
· 1 decade ago