Well don't know how much growth you expect to see in two days
also its a lot harder to tell when looking at them every day, and the reason pictures are handy.
As for the potential root rot what gives you the indications that is the issue if any as your plant on Monday looked super healthy, as for being rootbound welcome to my life and the life of a micro grower, but that's more a state of mind per say than an issue for us.
You could re pot now if you want but at 4 weeks will it necessarily allow you to grow a bigger plant, possibly but you could also slow it down with root damage and right now with autos its at that stage where its starting to switch over to flower mode where it focuses on bud production instead of leaves and roots, but by the looks of it your running plastic pots so its a easy transfer so long as you have the space, so its up to you but it will be fine to run out as is as for example my standard size pots i use are 400-500ml which is pretty small for most.
If you do re pot its super easy to do the whole planted pot transfer where you fill your new bigger pot half way with soil take your current pot and throw it in the center on top of that then fill soil up around the outside then when level with the soil in the current in use pot that has the plant just pull that pot out of the bigger pot leaving a perfect indentation, now flip your plant over with your hand on top of the soil say with the stem between two of your fingers and give the pot a twist or light smack and the root ball comes right out now put that in your previous indentation and pack the soil around it and give it a water and your done. Also helps if the soi/plant is at that stage where it need to bet watered, as the soil shrinks a bit when its drier, which makes removing it easier.
For your next cycle go for the biggest pot you can run in your space unless you have height limitations, or as many pots as will fit, there is no right or wrong on what to do, just different preferences.