Is there a thing as finding out too early?

I took my test yesterday and got my BFP on two different test. Now I'm scared out of my mind. The app is telling me that I am only 3 weeks pregnant. When I called the dr they laughed and said I hadn't even missed a period yet so no appointment was made. I continue to have mild cramps on and off and I'm scared of the bad things that could happen early on. I haven't had any symptoms panther than being really dizzy and tired yesterday that's why I tested. So I'm worried. Is anyone else with me?