No fluid in the cul de sac??

Ay, that's actually a good sign, mama! The cul de sac is a small pouch behind your uterus, at kapag walang fluid doon, it usually means there's no inflammation or infection happening, so basically your body is looking healthy sa area na yun. I'd still check with your OB para sure kung anong context yan (like if it's from an ultrasound or pelvic exam) kasi they can explain it better based on your full situation, but from what I know from talking to a few of my mum friends, that's usually nothing to worry about.