How to ask hubby to use toys on me...

Ok. So I really love sex and my sex drive is a lot higher than my husbands and I'm pregnant so super horny lol. We have a 3 year old who sleeps with us so we don't have a lot of alone time, we normally kinda plan sex night so its not always super exciting, I miss the spontaneity we used to have but that's another post. Anyways as I'm getting a bigger tummy its been harder to relax or have an orgasm especially sense my go to position to cum is missionary :/ Well a few weeks ago I ordered a vibrator and its pretty awesome BUT its huge compared to my glass dildo. I was a little taken aback by the size lol. So yeah, I like it alone but I'm dying to have my husband use it on me. He's only used my glass on me maybe 2 times and that was 5 years ago. I've always been more kinky hes kinda vanilla, I even showed him a vibrating cock ring they sold in Walmart and he said, no those are only if the girl can't get off, are you trying to tell me you cant??? So I don't think he likes doing that to me and I'm worried he's going to think he's not enough. But I really want it. How can I bring this up to him, I don't want to offend him 😫