I am 25 years old girl. I had sex on 4th february. And my periods are usually regular. Mostly around 16th to 18th of the month but during february it was 4 days earlier than the expected date i.e. On 12th feb and lasted normally for 5 days. And if I talk about march. It has not started till date. I am really very late which has usually not happened with me before. Are there chances that I could be pregnant? Please let me know as soon as as possible. I would be highly grateful to you.