Am i pregnant?

me

For the past week i been feeling nausea and i threw up once. This is not normal i normally get sick once a year around December & January due to the weather. But lately i have been feeling lit headed & nausea. Certain smells make my stomach hurt. My cycle isn’t suppose to start until the 20th. Is it possible for me to be pregnant & it is possible to get pregnant outsider of your ovulation date ?