I think I'm pregnant

Took a first response pregnancy test today and the results were positive! I'm only 3 days late but I'm always late so I'm a little skeptical. I've been down this road once before and by the time I'd made to my doctor to confirm, I was told I wasn't pregnant. So here I am a year later. I've been cramping since Sunday and I was expecting my period 3 days ago. Should I get my hopes up? I'm afraid to go to doctor right away because I don't want to be disappointed.