How to tell him I need to switch up sex now that I’m getting too pregnant!

Hey ladies! Looking for some advice on how to communicate something to my partner in regards to sex now that we’re in our third trimester.

Just to preface, I’m not worried about talking about this or fear it’ll be an argument, I’m just wanting some advice on what might be a sensitive way to “word” what I’m experiencing so we can make adjustments for the remainder of our pregnancy.

He and I have been having great sex throughout our relationship and during pregnancy. But now that I’m entering the third trimester, my hips and back are beyond uncomfortable and certain positions literally hurt lol. We’re not super rough with each other, but he likes to (and I used to enjoy it before this new discomfort) put me into the positions he wants me in while we’re in the heat of the moment.

This morning I woke up with so much joint and muscle discomfort from having my hip up, leg flexed and torso twisted last night! Lol

I NEED to let him know I need to have some very “vanilla” and gentle positions for the remainder of the pregnancy. But I’m struggling with finding a way to word it without making him feel like I didn’t enjoy it. I honestly did at the time! Lol

His last relationship (while years ago) seemed to have really hurt his ego in bed, and she would basically bark orders at him in bed, and even tell him to hurry up and finish, and that he’s bad in bed. (Must have been her fault cause we have tons of fun🤷🏻‍♀️😜) He’s communicated that when he doesn’t feel like he’s doing things right in bed, it makes him feel so inadequate and like he can’t do anything right. So while I do need to bring this up, I need to be extra sensitive since telling him things to do and not do in bed are a trigger for him from these past negative experiences.

Any advice on how to even start off a sentence is appreciated. I really want to tread lightly for his ego, but also save my uncomfortable, pregnant body! Lol