Hi there Tegan,

I had fluid in the pouch of Douglas before pregnancy because I had endo. I don't think that the fluid causes the m/c but endo can cause it.

Your fluid was present before pregnancy but should be ok now since you are pregnant.

If you are concerned then maybe talk to a to a gyno about this or your OB. You may need a laparoscopy to correct it. But if they say it is fine don't worry. Lots of people have this.