Please help!!

Go for it! If your quick, gentle, and move slowly - your plants will only notice the extra root-space
 
I do not think it is worth doing it, one it can cause stress and delays in flowering, two you are going to have to change around your feeding and nutes a little.....if this is in conjunction with your other post you made where you are running out of vertical room and your plants are still growing some then how are you going to fit a 5 gallon pot which is a foot taller than your 3 gallon? The reward is not going to outweigh all the trouble....how long did you veg for? Just because you see roots coming out the bottom does not mean root bound. Don't overthink this, make notes and do it different next time....you have a small space you can't really grow them big anyway.
 
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