Period 6 days late this has never happened?!

Here's my story any help would be greatly appreciated!! I'm 22 years old, if that matters... I was supposed to start my period on the 4th of June my last period was on the 5th of may they usually last about 5 days long, so today is June 8th.. I got a dollar tree prego test for $1 just because it said negative though.. Someone told me I need to wait longer.. But since I have glow as an app I can track the days that I had had sex only on the 8th 10th 14th & 26th. Can anyone give me some advice on what to do!? I just feel like my period is about to come that's why I dont know what I really think, just the usual... Headache, lightheaded, tired, pooping a lot lol, and stomach feels like pressure?