Just getting back on here. my period is due tomorrow

Sophia
my period is do tomorrow but I am having cramps and throwing up. I had sex on July 28 2016 and after that that's when I been having cramps like my period is about to come on but nothing showed up. I am hoping that I am. Any advise will help. Thank you. I am not new to glow I just haven't been on here for awhile.