Pregnant or not??? Help!!!

Okay I have taken multiple pregnancy tests all brands they all seem to show extremely faint line. All digital are saying not pregnant. I am 2 days late of my expected period. Maybe I ovulated late and am super early?? Or maybe I didn't ovulate at all??I've heard that ovulation test can also pick up hcg...idk why I would be ovulating on cycle day 28... I got this positive ovulation test today on my cycle day 28. Help please I'm confused.