Thank you for putting up your problem to Healcare Magic!
It is very unlikely that you were really pregnant.
It may be a delayed cycle, sometimes during excessive day to day mental/physical stress
the periods get delayed till you are in a better comfort.
In other cases there may be some gynecological problem related to hormonal
Still other possibility is of pseudocyesis- which is a condition of psychogenic origin where a women with desire to get pregnant, develops signs of pregnancy
even when she is not pregnant.
You need to consult your gynecologist as well.
I hope this information would be both informative and helpful for you