Report the message to your cell phone provider and have them block it if you don't know how.

someone sent a message saying they were going to meet me soon or I hadn't met them yet with yet in big bold letters and it says the number is from Oregon it is kind of frightening can you please figure it out. I don't understand how they could have gotten my phone number they said it was on some site but they didn't remember which one and I don't get on site besides Facebook.