Who are these women on his phone?

My husband and I have been together for 11 years. We just had a baby two months ago and of course our sex life has been kind of pathetic. I’m exhausted from not sleeping, and while his sex drive is definitely unchanged, he’s often grumpy and stressed because we are about to move into the house we just bought, plus there’s a newborn around, plus he’s working from home....we just have a lot going on. I’m 9 weeks pp and we’ve fooled around a few times, and actually has sex three times, but I’m not gonna lie it doesn’t really feel very good for me still. So I guess you could say I’m just struggling to keep up with his sexual needs.

Anyways, we were out of town this weekend at my family’s beach house. On the car ride home yesterday I went into his phone to send myself a picture he took of me and our son. He was in the gas station paying. When I opened the picture app there were four saved pictures of naked women. I was shocked. I closed the app right away and put his phone down just as he got back in the car. He asked what I was looking at and I told him the google map to check traffic. He seemed to buy it but he was a little extra sweet and chatty for the next 20 minutes or so, just making random small talk. We don’t really hide our phones from each other, and Im pretty sure he’s not physically cheating. The pictures were not of the same woman. I think it was at least two different women. I didn’t confront him about it, because I don’t want to turn nothing into something before I’ve had time to really consider all the possibilities. I honestly don’t care if he looks at porn or masturbates...he should. I can’t take care of him all the time. But why on earth would he have these pictures SAVED to his camera roll!? And it was weird because they were the most recent pictures on his camera roll, and he had taken pictures of our son after he had showered and BEFORE he saved those pictures, so it’s not like he saved them to go masturbate in the bathroom before he showered that morning. He must have saved them while I was showering. Idk. I hate that Im obsessing over this, but in 11 years together I’ve NEVER dealt with something like this.