Pregnancy cyst?

So long story short, I've had this nagging dull pain on the left side of my abdomen for 2 weeks, I am now 6 weeks pregnant. I of course have Internet searched for every possible cause. I'm am convinced it is either a corpus luteum cyst or an eptopic pregnancy. I have called my ob nurse practitioner who says not to worry as long as I'm not bleeding or in severe pain. Well guess what I'm worried. Has anyone experienced a cyst while pregnant? What exactly does it feel like? I've never had anything like this before.