My period won’t start

Nykeia

I keeps taking pregnancy test they keep coming back negative am i taking them too early ? i had sex 3 weeks ago and I’ve been tracking my period for years now idk what is going on but does anyone know what i can do to bring it down i have a lil head cold that’s the only thing i can think of as to why it hasn’t dropped I’ve been feeling crappy and tired but nothing s coming I’ve been trying to be patient but my nerves are everywhere i high key don’t wanna be pregnant don’t get me wrong pregnancy is a beautiful thing but I’d much rather be bleeding and cramping away please help