How to confront my husband about masturbation?

I'm 8 months pregnant with our second baby so naturally sex life has died down considering we have a toddler. We're both on opposite work schedules and I'm usually just too tired/fast asleep when he gets home from work. We've talked about how our sex life has died out and he claims that he "just isn't in the mood for anything like that and not even in the mood to masturbate" etc. Take note... He has been in a depressive state for the past few months. I agree with what he says about not being in the mood... but I genuinely feel that way. I have been finding articles of clothing with cum on them. And I do know he watches porn because I've seen brief search histories/his reddit. Nothing extreme...but the NSFW is there. I feel weird bringing it up because it feels like I'm approaching it like a mom catching their kid jacking it? Not in a weird way but like "hey I know you've been doing this... Wanna talk about it?" I genuinely don't know how to bring it up without it sounding weird! It only bothers me because he lies to me about how he doesn't masturbate. I already don't feel attractive bc of how pregnant I am and then we have to go 6+ weeks WITHOUT sex so that makes me feel like it'll get even worse between us. I know I'll get comments about how porn doesn't belong in relationships, leave him blah blah. But I just need advice on how to approach this. Please don't lecture me. I know it's a disease!

Tl;Dr husband says she doesn't masturbate, he actually does, how do I bring this up without it sounding weird that I've caught him?