Overweight and Pregnancy 🤰🏻

I’m 250lbs (for some reason I don’t gain at all anymore no matter what I eat. LOL maxed out I guess lmao) and 5’10 and my first pregnancy took a toll on me, as in I went from 173 in HS to 250 after birth. I’m just wondering if pregnancy is any different when you’re a little on the chunky side. Do you still gain weight? I read that you won’t gain much at all if you’re heavier set. I should point out the main reason I gained in the first place was because of Mirena IUD. I gained like CRAZY with that shit and can’t even seem to lose it even though I’m on Paragard (hormone free) now. Do you gain? Is it easier?