I think every second night is generally the recommended. You won't wear yourself out, and it means that you'll actually have active sperm in the ejaculate instead of just fluid.
Hi ladies 5dpo for me, finally got those crosshairs on FF. Been waiting for that to pop up for a couple of days. I always have a fallback rise so it generally takes 2-3 days for FF to confirm O, even though I've listed a positive opk.
So now I'm just waiting for the 1st to poas. I've been doing opks every day on the off chance that the first positive was a false. I've had that happen before so I wanted to make sure. But I've had a bbt fallback rise and it's started going up again so fingers crossed