What is the reason for pelvic effusion during prenatal examination?

Patient's question:

I came for my period on the 15th of last month, and today on the 22nd of this month, my urine test was positive. A detailed ultrasound examination showed no gestational sac, but a free anechoic area was observed behind the uterus, measuring 18mm in depth. The doctor concluded that there is fluid accumulation in the pelvis.
I would like to ask, how is the size of the free anechoic area determined? Is 18mm considered large?
Additionally, how is the pregnancy duration calculated? Online, most people (excluding doctors) calculate it from today, subtracting the day of my last period. Today, the doctor said I am 37 days pregnant and mentioned that the absence of a gestational sac is abnormal. However, in reality, my husband and I stopped using contraception only about 10-15 days ago. Shouldn’t it be considered about 10-15 days of pregnancy?
Lastly, what is the cause of pelvic fluid accumulation? Is it serious? I haven’t felt any discomfort.

Doctor's answer:

From your situation, it appears that you only have mild pelvic effusion, which is not considered severe. A thorough ultrasound examination did not reveal a gestational sac. This could be due to a shorter delivery period, and further careful examination is needed for confirmation. It is recommended to visit the hospital for blood tests to check HCG and progesterone to clarify the positive results. If necessary, please undergo a thorough ultrasound examination again in one to two weeks. As for pelvic effusion, since the amount is relatively small, it can be temporarily left untreated and addressed after delivery. Pelvic effusion is a condition that is difficult to fully heal. Friends who are patients should always maintain an optimistic attitude and face it with a positive mindset. Only in this way can they enhance their confidence in combating pelvic effusion and believe that recovery is certain.

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