Needing advice

I just had my baby 4 weeks ago, he’s breastfeed and I’m wondering when I should pump? The doctor suspect I am an oversupplier so I was trying to wait until 6 weeks to pump but I don’t know if I can. I’m waking up and changing my tops multiple times a night , when my baby eats a lot of the time he pulls off the breast choking and coughing and my milk is shooting out so fast my poor babies getting water boarded. I’m having to change my bed sheets often as well. I use my hakahh for the strong let down , if I start pumping now will that make me produce even more milk? Should I just pump a little before I feed him to help with the letdown or is using my hakkah in the middle of feedings the best option until closer to 6 weeks? I want to continue to exclusively breastfeed for as long as possible but I would like to have a stash for the future.