I think if I was in this situation I would feel it was taken out of my hands once done therefore I would want what I can't have - if that makes sense? Hate not being in control!
Im sure its pretty normal to feel as you do.
Stu said he'd consider this after 2 and tbh & I thought it was a too quick decision after just 2 but you guys have 4 children & if your happy with 4 cherish them & enjoy you family Layla (I know you do btw) they really do look like sweet kids I'd be proud of my completed family
Best of luck to you both & the decision thats lingering - do whats comfortable.