Ok my period is now a week late took a hpt today still negative. I am so confused. It is supposed to be 99% accurate now so why Have I not started. My period is alway on time give or take a few days. Never a whole week. I called my dr they want me to come in for a blood test they said that if I am there would def. be enough horomones by now for that. What are the chances that I am peeing negative and that I am pregnant. doesnt see very good to me. Could someting be wrong with me? if my blood is negative what should I be asking my doctor about? How long am I supposed to wait for my period to come back with out worrying? thanks for the help.