Good question! 10 days is just on the border of being healthy enough to sustain pregnancy. You might want to try vitamin B6 or bio-identical progesterone cream AFTER ovulation to help support your luteal phase length.
A healthy LP is generally considered 11-16 days. Under 10 is considered too short. 10 is right on the line.
Now are there any factors that might be affecting your LP - have you recently discontinued hormonal birth control or are you breastfeeding? If yes to either, time might be all you need for your LP to lenghten.
Hope that helps!
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Not to high jack the thread, but I am going through the same issue, only no BCP or breastfeeding in the last 2+ years. What else could be affecting it? I am going to the RE on the 12th and am hoping that she can help, but would love to walk in already pg.

I'll try the B6!
Thanks!