What Is The Meaning Of Free Fluid In The Pouch

what is the meaning of free fluid in the pouch of douglas,and what is the side effect on me trying to conceive, i am 29,female, My scan shows i have a free fluid in the pouch of douglas,i want to know the meaning,the cause and what treatment measure to take. My periods are not on monthly cycle. It is after 2-3 months every time. When ever it is there it lasts for many days, i have to stop by taking medicines, i have to take hormones treatment also.