Pregnant? Part two

Diawa • Mommy to beautiful rainbow girl 🌈
July 11, 2015
I am usually on time with my period every month, other then being a day late here and there. My Fiancé and I had unprotected sex on jun 26th and 28th, which was the middle of my fertile stage. My last day of my fertal stage was the 30th. I was suppose to start my period on July 7th, it still has not arrived. I have not been in a stressful situation and have not had any period like symptom. I really didn't even notice I was late until last night. Today would make it that I am about 4/5 days late. 
Should I take a pregnancy test or wait it out a little longer and when should I tell my Fiancé?
Update: 
So today I went to the restroom and when I wiped there was very light pink in color spotting on the toilet tissue. Could this be my "negative" sign that I'm not pregnant 😰