How long do i wait ?

Elaina • Mother of 3 living children,2are my husbands,1 is mine. When i was 18 i miscarried a child and 1/23/2015 our son was born sleeping
Af was due last wednesday, 7/22, and i still havent started my period,havent tested since friday but it was negative. I have no signs of Af and the only pregnancy symptoms i have is im tired alot,been having headaches and sinus problems,(not sure if that is even a symptom but im just saying). Until today,since the 17th i had ewcm. So in your girls opinions should i test again soon and how much longer should i wait till i call my obgyn to get a blood test or something ?