Hi Dr

My first day of my periods was on the 01/02/2013 and I am on a 28 days cycle . I was expecting them again on the 01 March . I am notusing any contraception . I had an unprotected sex on the 01 March-03 March and my periods did not pitch . Do you think is there possibility of pregnancy ?

Anytime there is penile insertion there is the possibility of pregnancy. However, if you had intercourse between 3/1 and 3/3, it is probably too soon for implantation. So your period being late may not have anything to do with it, unless you also had intercourse during February.

But you will have to wait until after the Ides of March to test.