Sounds very soon to me, but as long as you can do an emergency stop without pain and use all the gears with no issues, it should be ok. I was in a lot of pain after my op as I had unders, so at day 4 I could barely get out of bed on my own let alone drive. I left it quite late and started driving about 4 weeks po, but my surgeon had said about 2-3 weeks should be ok to drive. I’ve heard people who have had overs started driving after only a week