Is nausea and vomiting a pMS sign?

Ladies, please I’m confused here. So far, I have had nausea and vomiting for 3 days. Currently on CD 30 with no AF. Tested few days before Ovia suggested and it was a BFN. The nausea and vomiting continued after that. Thing is, this is very new to me and I’m honestly confused. Had this happened to anyone here before? Please share your experience. Thank you