pumping

I'm usually able to pump 3 times while my baby is at daycare. Today I'll only be able to do 2. I was planning to pump in the car on the way to pick him up and then I'll nurse when we get home. That would put about an hour between pumping and nursing. If I pump when planned it will have been almost 4 hours since last pump. Typically I do about every 2 hours, but couldn't today. Here is the thing....my son has been refusing the bottle today for some reason. Do you think I should just not pump and wait to nurse him as soon as I pick him up? I'm just worried about supply since I wasn't able to pump as often today.