is there a good chance I'm pregnant???

This morning I woke up & immediately took a clear blue digital pregnancy test & it almost immediately said positive, but it had the little book symbol in the top corner which usually means error(but said nothing about it also saying pregnant) so I took a first response & it was negative. I went & bought another clear blue digital & it said not pregnant. Some people are saying I could be super early on so it only detects it in my morning pee. What do you guys think??? I'm gonna take another clear blue tomorrow morning.