I am 3 days late on my peroid negitave test could I be pregnant?

Woman's body can sometimes skip a menstrual cycle if it is a hormonal imbalance in the body... This usually happens if there is a lot of stress before the cycle... this happens to many women in the world so there is not much to worry about but just to be safe then proceed to take a pregnancy test from week.3 to week.5... if it continues after 5 weeks then you should go to your doctor

Re-test with first morning urine, follow the directions carefully.

If nothing in a week or two, you might want to consult your doctor about having a blood test done.