M.T.
Hi, I'm a med student. So I know a little bit, enough to look it up :). First, take a deep breath, because you are past the embryonic stage where most damage from chemicals would occur. The PE in sudafed PE stands for Phenylephrine, which constricts your blood vessels. It can increase your blood pressure and theoretically can decrease blood flow to your baby (temporarily, while it is having its effects), which is why it's Pregnancy Category C, "Animal reproduction studies have shown an adverse effect on the foetus and there are no adequate and well-controlled studies in humans, but potential benefits may warrant use of the drug in pregnant women despite potential risks." And animal studies usually give a way bigger dose than humans would take. So taking it twice, I wouldn't worry about it, but I wouldn't take it again (you sound like you wouldn't anyway). The real dangers are pregnancy category X like accutane. Hope that helps, and good luck with your pregnancy! I'm 24 weeks.
M. T