It's possitble you O'd today, let's see what your temps do the next couple of days. With a + opk, that means you will O 12-72 hours after your +. As far as your temping, yes it does make a difference if you wake up and then go back to sleep for 1-2 hours then temp. You are suppose to get 3 hours of consecutive sleep. Do you get up with your son then lay back down? That will make a difference also. If you son ALWAYS wakes up at the same time, then I suggest changing your temping time to the earlier time (not this cycle, but next cycle if there is a next cycle

)
I hope that helps some. Good Luck!