Husbands phone and porn

Okay just need some help ladies... I'm very very pregnant due next month. We haven't been having a lot of sex just because it's uncomfortable for me... But yesterday hubby went to the store and I went through his browser history and found tons of porn. No I'm not mad I'm not freaking out I'm just a little in secure because I am almost full term pregnant with our 3rd son. I just wanna let him know that I know because he's not telling me he's watching it. Last night I tried to get it outta him by saying hey honey wanna watch porn together ( which we have never done) he replied with no we don't need porn.... I'm worried if he finds out that I went through his phone he will be mad. I know there's way worse that he could do than watch porn. But I just thought we were open about everything. And yea I'd love to watch it with him but how do I let him know that I know without causing a argument. Nice comments only please :)