Heya, everything looking great.
Are you in coco or soil? Ultimately they do slow down in root growth mid way through flower as energy goes elsewhere. And re-potting now can just cause undue stress.
Will likely mean you just have to water more frequently later on, which is not a bad thing, as the plants are getting fresh nutes more often.
Take a photo of that plant so we can get a size of how big it is and if it looks like it could get chocked up.
And lower leaves yellowing during flowering is normal, if this is the first yellowing leaf you have come across this far along, you are doing very well indeed!