confused

Ericka
I am so confused i want to have a baby, my first day of my last period was July 27th and it lasted 5 days. My cycle is 28 days so i should have my period today. Base on the apps am one day late. But i did the pregnancy test today and was negative :( can any one let me know if i am or not. Ps: i had unprotected sex on all my fertiles days!