Testing

Kate
So my cycles have always been very regular...16th of every month..before I was on BC and now after. 
Except this cycle I've been tracking my BBT and during my fertile week after entering that days BBT it shortened or changed the dates of my fertile week which of course brought my period due date forward to the 13th. 
I'm just wondering, should I count myself as late from the 13th or stick to my normal 16th..? I just want to know when to test. I've tried to be really good this cycle and not test till I'm late. 
Hope this made sense.