It's my understanding that if your LP is only 9-10 days, there's not enough time for the egg to properly burrow into the uterus lining and there's a higher risk of miscarriage or not conceiving at all. MrsGruffalo - have you thought of possibly progesterone supplements or something to lengthen your LP?
If your LP is 15 days and you're expecting AF in less than that amount of time, you have little to no chance of conceiving. The egg only survives for 12 to sometimes 24 hours after ovulation and you would have ovulated about a week ago.
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