3 days til expected period

..P..
I'm 3 days til my expected period and not feeling myself. I went and got some tests from rite aid earlier but I'm scared to take one! just so many mixed emotions right now. 
does anyone know if taking a test 3 days before a missed period is better taken with first morning urine or am I close enough to my expected period that I can take the pregnancy test anytime during the day?