Ectopic pregnancy!?

SO terrified of having an ectopic pregnancy! They want to possibly screen me for one and I don’t know what to expect if I do have one! I don’t have any of the typical “symptoms” for one but I have experienced a tiny bit of cramping but nothing crazy, and today I started getting a sharp pain on the side of my leg but it happened once and that’s it. No backache, no vomiting or nausea. I’m scared guys!