weird spotting?

Annika
For about 3 days I've been having spotting, my periods not due for like a week. I usually never have spotting at all, so I was already a little concerned. I called an advice nurse and they recommended that I come take a pregnancy test. I'm freaking out a little. My boyfriend lives in a different state and he visited last month and that was the first time I've had sex. We used a condom but I know things can go wrong. I'm not on the pill. Does anyone know what the excessive spotting could be due to? I'm also having mild cramping, off and on nausea, and headaches but those symptoms may be unrelated.