hi, last night i was smoking the last cigarette of the day with my friend and out of no where i started getting really hot and i had to run upstairs and i though i was going to throw up and when i was heading to my room i had to run back and throw up... i may be at risk of being pregnant and my friend thinks i may be since i threw up and his mom told him that shes only seen that happen 2 times and both times the girls were pregnant... i mean i think i may be but i have tooken 2 pregnancy test from the doollar store and they both came out NEGATIVE.... my friend wantsto buy me a pregnancy test but i told him that i am not and he insist to make sure... today just to make sure i smiked 2 cigarettes and i started getting all hot and i felt like i was going to throw up.... could i be pregnant? please i need help.... i am 18 y the way...