Hi, I Had Sex With My Boyfriend Last Year Round

Hi, i had sex with my boyfriend last year round Christmas. It was unprotected, I decided to take the map 16 hours later. My period was due on the 11th of this month and it is now 3 weeks late. I have been feeling sick (vomitted yesterday), feel tired and having abdominal pain.... Does this mean I'm pregnant? What do you think the best solution is because I don't want to have a baby yet.

Thank you