Umm I am 21 years. I've always had regular period. But last month I had my peiod for only 2 or 3 days around 14th or 15th of that month. This month I hvent had py periods yet. So I have taken a pregnency test which is negative.

Go to see the doctor to confirm whether you pregnant or not, it is hard to advice because they might be a reason why you only got you period for today. SEE THE DOCTOR TO EASY YOU MIND