I'm Trying To Get Pregant . My Last Period Was

I'm trying to get pregant . My last period was around July 27th. Based on research my fertile days were between Aug 7th to Aug 13th ..but I have been taking clearblue ovulation test and they keep coming out negative ? Could my fertile week be the following week ? I'm confused but I'm anxious because clearly I want to be pregant . We have been having sex everyday since August 7th lol