Cursed by My Sister-In-Law

I'm at the supermarket when an old woman I don't know suddenly grips my hand tightly. I instinctively shield my baby bump, but she says, "Someone has placed a swap spell on you. The dead baby is about to be transferred to your body soon."

I think she's a liar, but she says, "Hurry up and try to make yourself vomit. You should try to throw up as much of that fish you just ate as you can."