Years ago I went to the ER because I was throwing up all day. They asked, "Are you pregnant?" I said, "Well, haven't had sex in 6 months so I doubt it." "We better check anyway." So, I took a pregnancy test. Results were negative. I wish my response would have been, "One of us doesn't understand how conception works."
Never did find out why I was puking but it stopped. With all these horror stories, I'm never going to the ER again unless I'm unconscious and somebody drives me there.