Faint line on cvs brand test

Jayda

I took a cvs brand early detection test on 9/1/17 at about 11:30pm it initially came out negative. I later checked it, about 5am, and there was a very very faint positive. 9/2/17 first urine of the day, negative result. I've taken another this morning with a negative result. I'm soooo confused? I mean it's the holiday weekend so I can't get a blood test order till I'm back at work. Can anyone explain this or has anyone ever had this happen?