I haven't had a period in 7 months then 12 days ago i had a period. i stopped 5 days ago now i'm feeling nauseated,bloated and i'm vomiting. am i pregnant?

Need test: If you haven't had a period in 7 months and you have been having unprotected sex then you need to take a pregnancy test. You could be pregnant. If you are not pregnant please see a doctor as soon as possible to find out why you are not having periods. If you are pregnant start a prenatal vitamin and see an obstetrician.

Maybe not, but...: A urine pregnancy test, done correctly, gives a reliable result 3 weeks after sex (3 weeks after when conception might have occurred), or 1 week after missing a period. If done sooner, a positive result is likely real, but a negative result may be due to testing too soon, and thus lead to a repeat test. A trip to one's Ob-Gyn doctor can help figure out why one's periods are so irregular.