A member asked:

Natural fet cycle - serum lh surge on cd18, lining was 11mm, p4 rise from 0.3 to 3 on cd19, ultrasound shows lining shrinks to 9.5mm on cd21. why?

A doctor has provided 1 answer

Hormones: The lining grows in the follicular phase under the influence of estrogen. After ovulation, progesterone makes it stop growing and get mature and ready for implantation. These changes or just variation in technique or both can account for this.

Answered 10/3/2014

3.7k views

Thank

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