Hydrosalpinx-free fluid in Fallopian tube?

Tori • Happily married to my best friend! Environmental Chemist/Wastewater Treatment Plant Manager.

I just left a check up with my OBGYN to talk about some fertility issues. She ordered a vaginal ultrasound to just get a picture of everything and to make sure I had no cysts present. She said everything looked fine, no cysts, but that she saw from free fluid and couldn’t tell if it was from where I ovulated or if it was in the Fallopian tube. She is having me repeat the ultrasound in 6 weeks to see if it’s still there or gone away. Has anyone experienced this or has more info that could shed some light my way? I looked up the causes of this which are endometriosis, PID, STDs and reoccurring appendicitis. I have none of those so I’m hoping it’s just fluid from ovulation!