Hi, I Would Like To Ask If I Am At

Hi, i would like to ask if i am at rosk of pregnancy. My last mens was Dec 18-22, 2016. i had contact last January 1, 2017.. although it was withdrawal (pull-out method).. on january 2 at 445am 10hours after the deed, i took the first dosage (4pills) and at 4pm (after almost 12hours), took another 4 pills for the second dosage. During the First and second dosage, i felt headaches, nauseous, feels like vomiting, and abdominal cramps, amd tired and very sleepy. I really wasn't satisfied so come January 3, at 6am i took another 4pills, the whole day i had headaches, sleepiness, abdominal cramps and nauseaous amd feels like vomiting. Am i at risk? Answers and insights will be very much appreciated. Thank you so much.