I recently started charting to see when I ovulate I know that you start being fertile 14 days after the first day of your period counting the first day, then you are fertile for 7 days but you only ovulate one day of those 7 and its normally the last day but all of my ovulation test came back positive except the one I took after the day I was suppose to stop so I know that they work I did this to make sure I was reading them right but if you only ovulate one day then how come all of them came back positive ?

Where did you read all of this.

Not every woman is fertile at day 14. That is a mathematical average.

How are you charting your ovulation? Please don't tell me it's an app.