Period help? Tips please!

Heather • 22/Nebraska bound.
So, I had sex with my boyfriend three times during my fertile window stage and I'm only two days late on my period.
But I'm worried about being pregnant.
I have began to bloat, and I have extreme pimples like I usually do before my period, I've also been having cramps.
It's only been about a week since the time I'm worrying about, so I don't think I'm pregnant but I'm still worried!
My period likes to change a lot and I'm on and off about exercising.
Plus the sex was unprotected and withdrawl method. 
But I keep getting these weird tummy nausea? Like my periods coming any second but it's not here.
How long after my period do I wait to take an at home test? 
Should I be as worried as I am? 
Any tips to make a period come faster?