Hi quick question my last period was on June the 6 th and I still haven't came on mine for July went to the doctor on the July 8th but they could not dectect any  hcg iin my blood or urine now its the 13 th and still no period could i be pregnant or is it in my head also the last time we had sex was on the 6th of this month July and before that last month June 25 th please help