birth control

Someone help!!! Ive been on my birth control for over a year now and I hardly ever miss and when I do I never double up. Last night I doubled up since I missed a day and I can't remember if I have ever doubled before. But this morning I woke up feeling super nauseous and I puked once! I don't know if this is normal. I thought maybe it was a shock to my body since I have never taken 2 in the same night. Is this normal???