my last period was the 23rd of January making me about 2 weeks late. i have had 2 negative urine tests and a negative blood test so we can rule out me being pregnant. the doctor also said my thyroid is fine and hormone levels are all normal. i have not been any more stressed than usual either. so i asked him what do i do if i miss my next period and he told me to not bother calling them until i have missed 5 or 6!!!!! why have i not had a period?? and surely waiting to have 5 missed period is bad? surely to have missed more than one something must be wrong? help please !!!