Testing....

L
So I have a question. I took a test today and it was a BFN. I only took it bc the app said go ahead and take one. I'm suppose to start my period Monday. Is it possible to have tested to soon? The info packet in the box said can tell if your pregnant as soon as the first day of your missed period. I'm just confused bc this is our first time trying to conceive a baby and everything is all new to us.