Im so scared, im freaking out..?

had 12 days ago when i was on day 8/9 of my cycle had bn on birth control for the first time.. due to a stomach upset had to take plan b.. i'm now really freaking out as i have bad nausea and pain on left hand side of my tummy..im really worried incase plan b and the pill didn't work.. I may have bn ovulating around the time.. I'm so scared please help