Feeling frustrated

Went to the OB for my follow up appt from my D&E a month ago. I've already had one period and it came right on time at 27 days. I should be ovulating soon but she's insisting I wait one more cycle. She said my endometrial lining was measuring at 6 mm but I'm a little confused bc I thought that was in normal range for cycle day 8/9. Any thoughts? I'm feeling pretty defeated and disappointed in my body right now. Any thoughts? Also, what are options for building up your uterine lining other than Royal jelly and red raspberry leaf tea? TIA ladies!