Clearblue dual tests confused

Hi all
In prep for next cycle I purchased the clearblue digital dual hormone tests. I have a couple of questions to anyone who has used them or currently using them. 
1. It says to test your first urine after sleep. Previous advice and research has said not to test first urine. Did you test on first urine?
2. Do you continue to test until you get a peak fertility even if you have had a high fertility result? 
Thanks in advance ☺️