please help

Dee
So I found a ovulation test in the draw and decided to take it. 
Af is due tomorrow  I don't know why I took it but it was a moment. 
Went up stairs didn't think much and it was a clear possitive ! 
Whaaaaat! So am I ovulation now not when I thought I did when glow told me. 
Is my cycle messed up!? 
Any info, advice or own experience would be hugely appreciated!