PREGNANCY?

i was supposed to get my period 2days ago, now i have had another scare like this yet my symptoms weren't as bad. last time i got my period a week after i was supposed to so i am not sure if i should wait longer to test...i have been throwing up every morning i wake up and once more around 11 every day for the past 2-3 weeks, along with that i have lost at least 10-15lbs in weight the past 3weeks and multipule people pointed it out yet i had no idea i had lost weight, lastely with that i have gotten sick everytime i try to smoke a cigarette. how likely is it i am pregnant?