Is he not attracted to me?

So for past few weeks or so my SO hasn’t been engaging in sex with me. I’m pregnant btw in my third trimester. If he tries to engage in it whenever he tries to go inside me he’s not hard enough to go in without a fight. He tries and tries but it’s usually a lost battle. He only engages in sex like 1 a week. He’ll touch me and cuddle etc but 🤷🏽‍♀️. I told him before I feel like he isn’t attracted to me anymore he said it’s not me that I’m perfect but the not getting hard thing happens sometimes and it’s embarrassing for him. Idk I don’t wanna say anything again because I don’t want him to feel bad or want to start an argument or anything. I don’t think he’s cheating.