Desperately want a breast reduction but I plan to have a baby in the next 3-5years

I hate my breasts. They’re so damn heavy, they’re always so sore, they hurt my back and shoulders, they put so much pressure on my chest that it’s hard to breathe. When I need to catch my breath I literally have to hold up my breasts with my hands. I’m 27, I can’t even find actual bras that fit anymore. I only wear sports bras now. My old ‘normal’ bras are size 34H. They’re about 2 cup sizes too small now. I’m average sized, so my very large ~J cup looks very disproportionate (and definitely not in a sexy way), and it makes my torso appear very short. If I had normal boobs I could fit a medium womens shirt. Because of their size I usually have to go up to an xl. I hate it so much and I desperately want to get a breast reduction. I want them down to like a D or C. But the only reason I haven’t talked to my doctor about it yet it’s because my fiancé and I are planning to have a baby in the next ~3-5 years. If I get a reduction then get pregnant after, won’t they get bigger again? Will it be a total waste? On the other hand if I get pregnant without the reduction then they’ll get even bigger than they already are and I’ll be so much more miserable.