I am having deja vu as I swear I answered this, so sorry if it is a repeat somewhere else. Alarmed isn't the right word. Women are often late and often for other reasons than pregnancy like illness, stress, changes in routine, weight gain or loss, etc. Wait a full week, try another test. But you may just really only be late. You always have the option of calling your doctor. And if you go a full three months without a period, do call your doc. It takes the average couple a year to conceive. good luck