Help!!!

Cyndrea • 35 years old...Married 4/2/16💍👰🏽❤ TTC #1🤰🏾BFP 1/27/2020 mmc 2/24/2020 👼🏾

I'm on cycle day 14 & my lining is 4.17mm. On cycle day 11 my lining was 5.7mm. What can I do to increase my lining & have this happen to anyone?