False positive or false negative?

Krista

So at 4:45 this afternoon, me and my fiancé decided to take a digital clear blue test. Waited the three minutes and went to look at it and it said pregnant. Well now at 7:50, took another clear blue digital test and it came up not pregnant. I’m due for my period on the 29th really don’t want to get my hopes up. How likely is it that it’s a false positive or a false negative?