Do you count 63 days from 1st breeding or from when they reached 5ng which is usually 2 days later?

TIA

from ovulation

You count 63 days from when progesterone reaches 5ng. Ovulation occurs at 5ng. Typically your first breeding would be 2 days after a reading of 5ng.

Actually, the first breeding is usually 2 days after they hit 5. But, to answer your question, you count exactly 9 weeks from the day they hit 5. That is your due date.

I actually find that my girls whelp 61 days from ovulation, 63 days from the LH surge.