Porn obsession?

I was a bad person and looked through my SO's phone history. I don't mind that he watches porn... but he watches it damn near EVERYDAY!! As long as my sex life isnt effected I've never cared... but that just seems excessive! How do I bring it up to him? I'm going to look like a jerk regardless for simply looking at his phone history. But being pregnant, I've never felt so unattractive and I feel threatened by his porn addiction. Please help!