Possible to change soil?

My soil doesn't have perllite in it and I should have done that plus I found some new better soil......My plants look droopy and I think the soil they are in is wack so is it possible to change them over into new soil without f'ing up my girls? they are about a week or two from flower time and in soil obviously.....HELP!

You can transplant your ladies into new soil, won't hurt them. Just be careful when handling the rootball

thank you sir!!

No prob bob......also after you transplant them, you wanna give them a good watering