1 week after Static Smiley OPK..help!

So I'm one week after I had the static smiley face on the dual clearblue ovulation stick.. is it normal to have had a bad headache for most of the week? I don't usually get headaches like this :-( my friend suggested it could be an early sign but I just thought it'd be way too early??? Does anyone have any experience of this at all?? I can't test until another week can I? X x