My partner has been watching porn behind my back

I’m 36 weeks pregnant and just found out my partner has been watching porn since I got big in the belly.. He has countless photos of me before I fell pregnant that he used to use on the rare occasion that he wanted to masturbate, now he’s watching porn and doing it every night I’m at my mums place.. It kinda makes me feel ugly and gross and like he doesn’t think my body is good enough anymore, and that it won’t be after our baby is born.

He used to always tell me that he never needed porn and that he hasn’t watched it in ages, I feel like I wouldn’t care so much if he was honest with me about it, plus he knows it brings down my self confidence to be naked around him when I don’t feel good enough for him.. Should I be upset or am I just being a sook?