congrats. i started my prog 3 days after i got the positive OPK to make sure i had already O's because like mommyin09 said, it can take up to 36 hours after you get the positive. so start them the morning of the 3rd day:)
Mommyin09 is right. Generally you will ovulate the day after you get your surge, and 1 dpo would the the day after ovulation. Good luck this month!
Congrats on the +opk ! :) The +opk means your lh surge was detected & you'll generally ovulate 24-36 hours after your first +opk. You should keep up the bd for the next few days. If you're like me, you'll get a dip in your temp on the day you O, and then it will rise. Once it's risen for three days, you know you've O'd. Your doctor told you to start your progesterone 3 days after you O or 3 days after you get your +opk? I start my progesterone the day after I O, which would be about three days after my +opk. Keep up the bd'ing & best of luck !!! :)