Thanks for writing in.
This is a normal report and there is nothing that you need to worry about. Fluid collection in the pouch of douglas is indicative of ovulation. This would be normal if your LMP was 22/4/2012. Also, the thickness of the uterus is normal.
There can be several other reasons for abdominal pain
like pelvic inflammatory disease
, infection of the small intestine
and peptic ulcer
. If you can let me know the details of the pain and any other symptoms that you have, I'll be in a better position to help.