Pumping help!

First day at work where I didn’t have baby so I brought my pump to pump.

This morning I fed baby, pumped just under 4oz and then fed baby again before leaving.

2 hrs later I pumped again getting just under 2oz in 20min

2hrs later I pumped again getting 2oz ( I was looking at pictures of baby this time ) Also in 20min.

After 20min the milk just stops no matter what I do.

I only pumped enough for one bottle!! ( the 4oz from this morning was used today)

What do I do!!?