Today my pump started making a hissing sound (similar to a bicycle pump) when I use it. I checked all the connections and there is no fluid in the tubing. Has this ever happened to anyone else? I EP and the pump is only 5 months old.

M/C #1 - BFP 12/28/2008. Confirmed m/c at 6wks - blighted ovum on 1/9/2009.
M/C #2 - BFP 6/16/2009. Confirmed m/c at 7wks - blighted ovum on 7/1/2009.
Re: PISA question
mine does at times
it comes from the yellow port thing in the middle