Heya
Do you have a link to your chart that I could see??

Just want to confirm... you took your temp AFTER you droped your kids off to school? So you were up and about (obviously) and then took your temp? You should take your temp before you even get out of bed..

I think ovulation can change all the time. And an OPK could detect ovulation up to 36hrs away I think, so you could O over the weekend? I know with my O pains, I will have a bit of a dull cramp/back ache before it intensifies and then goes away. I think this happens over a couple of days for me..