Porn!!

Stephanie • mom of 2 boys married to my high school sweet heart and living the best life i can
So i found porn in my husbands phone yesterday. I was not going though his phone he told me to look at something but he must of pressed his internet history when passing me his phone and I saw it when I grabbed it from him.
It very weird because i really have nothing agents  porn never really cared or nothing and I have no problems with people and couples masterbating but what is really bugging me is in the five years we have been together he has never watched porn never masterbated nothing (at least that is what he has told me) But In the last year since we had our son I have noticed his sex drive go way down he never wants to have sex with me it seems I have to basically bag for even a little bit of intamicy and even then he's in and out and asleep.
I have talked to him about our lack of sex and he said he still loves me very much still very attracted to me he's just tired.
But now I found this porn on his phone and now I'm thinking he just isant attracted to me and that's why he is looking at these other beautiful girls and using them to fill his sex drive.
I bright it up to him and he said he looked it up at work because his work buddy's where bugging him that he does not watch porn. But we don't have data on our phones so you can't use the Internet when not at the house.
I brought that up to and he was like Tim hortans has free wifi. 
Something has seemed off about our relationship.
Now I'm 7 weeks pregnant again (I know I said we don't ever have sex we don't this was on v-day where I told him we either celebrate it or I'm leaving because Am starting to feel very self conscious feeling like my husband does not want to touch me and be intamite with me.
And finding this porn just added to it 
I'm at a loss feel alone and just feel ugly 
I just want to add that we are only in our twenties so for his sex drive to be starting to lower is very unlikely, I have tryed to spice things up and even start the foreplay and I get shrugged off.
Also want to add that since we got together witch was at me 15 him 16 I have been the only person my husband has ever been with.
Is it okay for me to be worried that maybe he is getting ceriouse about being with other woman??
ALSO WANT TO ADD THE PORN IS NOT THE PORBLEM I DONT CARE IF YOU BELIEVE THAT HE HAS NEVER WATCHED IT OR NEVER MASTERBATED YOU STATING THAT HE PROBABLY HAS JUST MAKES THINGS WORSE!  AND AGAIN THE PORN IS NOT THE PORBLEM THE PORBLEM IS THAT OUR RELATIONSHIP IS SUFFERING BIG TIME I DINT KNOW IF ITS FROM THE PIRN IF ITS HIM OR IF IT IS ME!