What does a small amount of fluid in the pelvis mean?

Patient's question:

What does it mean if there is a strong echo on the inner wall of the uterus and a small amount of fluid in the pelvic cavity? Also, what does it mean if the thickness of the posterior wall of the uterus is 0.8 cm?
First follow-up question: I'm wondering if this is an abnormal condition? Does it belong to gynecological diseases? What are the specific causes, how should it be treated and prevented?
Second follow-up question: How should it be treated? The doctor at the hospital also mentioned that it should be combined with clinical findings, but I don't know what caused it. I've been very careful about hygiene. Are there any signs of pregnancy? I took a urine test a few days ago, and it was weakly positive, but my period hasn't arrived yet.

Doctor's answer:

The problem is not very big! You can wait and see first.

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