@Roxystar23 What’s your physical starting point? You see, I’m naturally scrawny with a low BMI, which is a family trait. Pretty much all the weight I gained was baby and placenta, so once my post birth belly deflated, I was pretty much back to normal and wearing my old clothes, just with leaky boobs. It’s worth asking your mother how it was for her, as I gather my mother was similar. No credit to me, just the luck of genetics.
However, I have friends who not only gained weight but had ‘structural’ changes too. One, her rib cage was several centimetres wider for ever more after her first, no matter where her weight was at. Another went up a shoe size permanently. (The shoe size one freaked me out, but, as it happens, I wear few of my pre-mummy shoes anyway. Heels? Are you kidding me?) So, as others have said, your body may change significantly, whatever your weight, so there are no guarantees.
However, I would personally delay your wedding because even the most low key day is a lot of work and stress (sometimes felt like a second job) and I’m confident I wouldn’t remotely have been able to handle it as a sleep deprived mother of a newborn, who could barely remember my own name and wept uncontrollably at ads on the telly. Give yourself space for at least the first six months and don’t seek out an6 extra pressure!!!