Cycle day 9 and uterine lining only 4.1mm

Nuzka • TTC #1 after a miscarriage

Hi, i went for a pelvic ultrasound today for just to see everything ok since we have been trying to conceive for a while, my uterine lining is measuring only 4.1mm on the cycle day 9. They said its not thick enough for cycle day 9. And i will be ovulating in another 6 days or so,

Does anyone have any idea what i can do naturally to thicken the uterine lining,