Could I be pregnant

Is it possible to get pregnant one day after my period! I feel horrible, and my period is going to come in two weeks supposedly. I feel horrible, I have been vomiting, and I was perfectly fine two weeks ago, but I did have intercourse before I came on my period, my boobs hurt. But I thought that I could only get pregnant during ovulation. I feel like I am getting sick, and I have been vomiting since yesterday, anything I eat comes up. But it is impossible if I was not ovulating