Ovulation prediction questions

Tracy
A few questions for those that have some good experience with these things :)
What time of the day is it best to test?
Should I avoid first morning testing? (Darn directions don't say!)
I have gotten positives the past 4 days in a row. Had my period on the 14th so I'm pretty positive I'm not pregnant. I have other children but have never used the kits before.
Any feedback is greatly appreciated :)