BF question

So today I left half of my pump supplies at home. I went on my lunch and got a hand pump. I could not get it to work very well(I have zero patience) and got a total of 4 oz today.... I usually pump at least three oz each time I pump and that usually ends up being at least three times a day if not four. I nursed LO as soon as I got him and then pumped as soon as I got home.

Think this is going to cause my supply to drop? Should I be doing anything tonight to ensure that doesn't happen??