When did my ovulation occur?

okay i got my first positive opk on april 29th started testing everyday until it turned negative which was 5/4/11. here is how my test look, the first one 5/29 was the faintest then a dark one on 4/30 and then a lighter one on 5/1 the darkest of all of my opks were 5/2 did i ovulate on 5/2 since it was the darkest out of all of them?