Could regrowth happen with a radical reduction?

I'm still in the early stages of getting a reduction and i've been worrying about regrowth. I'm currently a around a 32 H-K us the a bra that fits calc says I'm either 30 J/K or 32I/J based on the measurements.

And ideally I want to be semi flat so much so that nothing really hangs off me. I know that if I get regrowth I could never tolerate being my current size again but I really don't know how to feel about having a little more than semi flat, I'm just so dysphoric right now and I keep overthinking how I should want to look and my identity, I really don't want to have to do this twice.

I just feel bad about not wanting boobs or ever wanting to have kids/specifically breastfeed bc I know I don't want any of that but ppl keep saying keep an open mind and that opinions can change but also to do what makes you happy but to not be too rash about it. I just want to be happy with what I want.