Pregnant and Not Sexy

So, I'm 35wks pregnant with my second baby. I have been having a lot of trouble with my self-esteem lately, dreams of my husband leaving me because I'm no fun to have sex with anymore and honestly just feeling incredibly undesirable. I never felt this way with my first pregnancy, but then I had mild PPD and apparently let myself go. My husband admitted to watching porn for 8mo starting late in my pregnancy, 2 of which he completely stopped having sex with me. During those 2mo I had asked him if he was "taking care of himself" and he denied it. Between the porn, lying, and the fact that I was already pregnant again when he finally told me the truth I just ... idk. I can't shake it off and for some stupid reason I'm feeling badly about myself over it. Advise on how to raise your self-esteem while super pregnant? Or better yet, how do I raise my self-worth without tying it to my waste line?