Hi!

Does an Endometrial Biopsy have to be performed EXACTLY at 7DPO to test for Luteal Phase Defect? Or can it be done at 6DPO or 8 DPO? I know that 7 DPO is ideal, but what if it's not possible? (it looks like 7 DPO this coming cycle for me will be on Christmas Day and the doctor's office won't be open).

Thanks in advance for your help!