I am about 15 days out and had the same sort of pain a few days ago after bending down to make the bed. I went to my surgeon who said that this happens, and is really painful after bending or lifting something. What happens is a small blood clot (not the dangerous kind that can cause heart or lung problems) can form under the port it should resolve in a few days. The doc said this can happen up to 4 wks post op.
Hope this helps.
Jen