I just started my period today and i have been having really bad cramps. as soon as i had breakfast i threw up. is it possible for me to be pregnant?

Hard to guess: It can be hard to tell if a woman is pregnant because some of the symptoms seen in early pregnancy can also happen in non-pregnant women. A urine pregnancy test gives a very reliable result if done correctly. One can test about 3 weeks after sex (when conception might have occurred), 1 week after missing a period, or after having a "weird" period.