Dear doctor,
I had my periods on January 15 to jan 19.after that on jan 31 I had an unprotected sex.after that the next day I took yasmin pill and till now continue taking it.but periods didn't come yet.some days back I got fever n tend to vomit.but after taking pills it cured.today I feel very lazy n I didn't take any thing yet now because I felt abdominal pain.am I pregnant?

The only way to know for sure is to take a pregnancy test. It is possible since you had sex. Its also possible that taking Yasmin has affected your cycles.