Anyone else’s boobs getting bigger with age?

So before I met my husband, I was barely an A cup. I was also underweight due to stress. Once he and I moved out together, I gained weight and my breasts filled out nicely landing around a 34B. We’ve had two kids since and my breasts have fluctuated with pregnancy and breastfeeding but after my second (last) child, they settled down again to a 34B. I never lost all of my baby weight, and I would be happy to lose another 10lbs, but I haven’t gained weight at all since having my second. I’m by no means overweight at 5’2” and 126lbs.

The last time I bought bras, I even tried on a 34C and the cups were too big and gaping at the sides. Recently I’ve noticed my bras are no longer fitting; my nipples slip out often and there is bulge over the top of the cup. I measured and tried on different sizes and I’m now fitting a 34D! I don’t understand what happened. Has anyone else’s boobs gotten bigger with age or is this something to be concerned about? Honestly I was happy with my B cups, these suckers get sore when they bounce around too much and they get in the way of things. 😂 I know I need to go buy new bras but part of me hopes they’re just going to go back to being the size they used to be.