Jessie James Decker will have a lot of milk on deck pretty soon as she navigates her fourth pregnancy — something that’s definitely on her mind … especially after getting implants.

The singer was answering questions from fans on social media, and when one person asked if she was nervous about breastfeeding now that she’s cupped up — which happened 2 years back — JJD answered honestly … explaining a bit of buyer’s remorse.

While Jessie says she’ll be able to feed her forthcoming baby just fine … she does wish she wouldn’t have gotten them so big to begin with if she knew kid no. 4 was in the stars.

She writes, “When I’m pregnant they get massive like quadruple in size 😅😅😅 Def will need a reduction in the future & will downsize. It was fun while it lasted. But phew dey bigz already and I’m over it. Give me some shmediumz😂”

Jessie’s been upfront about her personal health and medical decisions — including the fact that she wanted her hubby, Eric, to get a vasectomy after they had their 3rd child.

That never happened, obviously … and now, JJD has a lot on her chest to deal with.