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Size of follicle and endometrai thickness is important to watch.
follow up is required for growth of dominant follicle and time of proper rupture.
There will be some fluid in POD after rupture of dominant follicle.
Endometrial thickness is also important to keep pregnancy
Doctor can also manage the time of rupture by giving b-HCG
5000 or 10000 units.
Ask your treating doctor for your confusion.