When to take pregnancy test, help!!

Laila
Sorry for the TMI...but here's my confusion. 
​-July 1-5 had my period
​-Had unprotected sex on July 12 which was the most fertile day ( according to glow) 
​- had pink spotting on Friday July 18th
​- took pregnancy test on July 23, had negative result. 
​- next period was supposed to start today on July 28, till the 3rd of August ( did not get my period today) 
​When should I re-take the pregnancy test?? I think I took it WAY too early before. 
​Thoughts anyone?