8 days late

Rebecca
Ahh!! I just wanna scream, AF was suppose to come on July 1st,it's now the 8th. I am having nausea,cramps,creamy cm,horrible headaches,etc. I have tested and tested and tested but all I get are BFN!!! Has anyone been pregnant but unable to get a BFP until they are about 6 or 7 weeks along bc og the Hcg? The longest I have been with out a period is 33 days and I am going on 38 right now.