Proov Check Early Pregnancy Tests detect hCG in urine to test for pregnancy. You can use Proov Check up to 5 days before your next expected period — that’s 5 days earlier than a normal pregnancy test! Because when you want to know, you want to know now. Check for pregnancy up to 5 days before your next expected period. Results in 5 minutes. 99% accurate at detecting hCG in urine.