Hey there, I never took plan B but the friends of mine who have said it made their periods come early. None of them felt nauseas or v'd. I was on birth control and found out I'm sensitive to hormones, meaning it made me a mental basket case. Birth control didn't make me v* nor did it make me nauseas. It's different for everyone, but in my experience, even being hormone sensitive I didn't get nauseas. Condoms are your best bet. Condoms are effective with no side effects, if you find you don't like using them, there are other hormone free options. I think you're probably fine hope this helped.