uterine lining shrunk by 1/3?! (ghost!)

[leorira11]

I was a bit worried that my lining was getting too thick.

At my baseline, my lining was 9.2, but doctor said that was fine. After 4 days of stims, my lining was 12 (!) but that was also fine.
At today's u/s (3 days later), my lining is 8mm. That means that from Thursday morning to Sunday morning, the lining shrunk by a third! WTF?

Does this negatively affect my chances of getting pregnant? Is it a bad sign for the cycle (follicles are still growing)?


thanks!