I'm on birth control and had sex on 5/9 without a condom. Although there is a slim chance of getting pregnant on birth control my boyfriend was still scared so I took plan b on 5/11, 2 days after sex. I am due for my period today, 5/17, according to my BC pills, so I think I might've been ovulating when we had sex. So I took the plan b and for the next 2 days I was fine with no side effects, then on 5/13-5/16 I felt nauseous and even threw up at one point, and I also have been having cramps and pains in my stomach. Are these side effects from the plan b even though it's been almost a week or am I pregnant?