When I did the 80% change on my OEBT/Supreme tank yesterday there were 4 berried Supremes in there. There are still 4 berried Supremes. Plus, if they're going to drop them it's going to be the next day, not just a couple of hours after a change, typically anyway. I'm sure they'll be fine. First time mothers can drop them just because they don't have the art of holding them down pat so if this is a young shrimp and her first time being berried don't be surprised if she drops them (and she probably would have water change or not).