In need of guidance.

My husband and I have been married for a little over 2 years, for a little while at the beginning of our marriage he had a porn watching habit. I let him know it bothered me. (I'm not against people who enjoy it, it's just uncomfortable for me.) So he stopped watching it. A few months ago, he admitted to me that he had watched it again. We are now expecting our second child, and honestly my sex drive is just non-existent right now, I can tell he's getting frustrated and inpatient about the lack of sex, and I have the fear he's going to just start turning to porn again and not have any interest in me. Has anyone else been through this and have any good advice for how to get through it without a fight?