Oversupply?

Ellen

I pump 3 oz in 3 mins. My baby is 4 weeks tomorrow and takes about 3/4 oz per feed. I mostly breastfeed but have been pumping once per day and giving her a bottle to make sure she can take both boob and bottle. Is 3 oz in 3 mins typical? Or am I totally oversupplied? I do notice my baby choking on breastmilk and spitting up a lot during feeds. Any advice welcome!