i am 29 year lady,i have five year son ,he is prematured baby but nowhe is good and normal,now i decided abt second child,this month we try,my due date is august 1,and i have regular period ,but this time periods not comae till august 6,i check pregnancy test but it isnegative ,but i feel many change is my body,continuessly pain in my back and i feel tired these things happen in these fifteen days did,it possibel to get positive result if i wait another onew week