I have trouble getting some responses on here..

Crystal • mommy to 4! eric - 01.09.2010 ;; ella - 04.03.2012 ;; richard jr. - 03.01.2020 ;; waylon - 11.24.2021
My friend took a hpt yesterday got a BFP. Clear blue Digital 1-2 weeks.. Then this morning she tested again and it said not pregnant.. 
How likely is it that it's either 1 a false positive or 2 a false negative.