I would agree with pt8am Doing heavy weight lifting with a known disc prolapse is a good way of prolonging the recovery time. Find a position in lying that relieves the buttock pain and stay there for 20 to 30 minutes would be a good idea. THen do some gentle spine movements in lying for another 10 minutes before loading your spine. The longer you can take the pain out the better at the acute stage.

It would be important to get back to normal everyday activities without pain befor even thinking about weight training.

Let us know how you are progressing. good luck.