Late but negative?

I've been feeling pregnancy symptoms (peeing constantly,emotional,vaginal discharge,tender breasts,even morning sickness) so I took a test 2 days before my expected period and it was negative. I didn't think too much of it and was super relieved. I'm now 2 days past my expected period date. Honestly I don't think I am pregnant even though I'm still experiencing symptoms but what are the chances of getting a false negative? Just curious?