Hi. Welcome to HCM. There are many reasons beside pregnancy for delayed periods. these reasons are stress, illness which affects ovulation, any new medications or changing the dosage on an existing medication can affect all aspects of your body’s well-being, including your menstrual cycle, a major change in your weight -either by gaining a lot or losing a lot of weight — can affect menstruation, exercising Excessively. You have not mentioned if u people had sex after the previous menstrual cycle. If yes she might be pregnant and urine pregnancy test sometimes may come positive after 7-10 days of missing her period. I suggest u to follow your doctor advice and preferably use condoms to protect yourself from unwanted pregnancy. Regards.