Yeah, if you get sick right afterwards or shortly afterwards, just skip and take next day. There were a few times when I was pregnant with my son, and even in this pregnancy that it has happened to me. I also have to take an iron supplement this pregnancy, and I got sick about 30 minutes after taking both pills (had taken my shower, and got overheated). I freaked myself out because the iron pill is red, and yeah you can imagine what it looked like. I also yelled to my OH that we had to go to the hospital right then and there, but then realized it was just my supplement.