Is it possible to have a reaction when sperm meet an egg? I would only be 1 or 2 days past ovulation, but I had a spell where I felt super nauseous. I wasn't doing anything too strenuous; I was only washing the dishes. I started clearing one side of the sink as quickly as I could because of how nauseous I felt. Once I got that sink cleared BOOM vomit. Not a lot, but enough to make me wonder if I didn't just have a reaction to sperm meeting an egg. Now I feel fine and I felt fine before. Could it also be the fact that I took a prenatal vitamin for the first time today? I only took half a dose. Anyone else have this happen?