So my last period was june 16th-19th me and my partner have been having sex every couple of days since, this month i was due to have my period on the 20th july, its now the 27th and still no sign of my period i took a test on the 20th and it was negative, then another one couple of days after and the last one i took was yesterday(26th july) and still negative, im just so confused and not sure whats happening had backache for a few days and cant stop eating, need help dont know what it could be if im not pregnant!!