it's a good thing you couldn't vomit! Not only is it highly uncomfortable to do, but it also could have decreased the effectiveness of your pills.
I noticed nausea with ortho-lo personally, when I switched from taking them in the morning and moved to taking them at night. I was eating smaller meals at night than in the morning, and I ended up puking two or three times before I realised that if I took it at night, I had to take it with somthing very small (I have to eat food when I take any pill, otherwise I can 'feel' it in my throat) or I'd get sick. When I take it in the mornings, I'm fine for some reason.
I was getting sick about 6 hours into the night after taking the pills.