If you spotted shortly after your last AF it's possible (although not for sure) it was implantation bleeding. No way to know for sure unless you confirm with a HPT. By what you said you could test now since it's been 2 weeks since the spotting. Be sure to eat right and drink plenty of fluids in case your dizziness is from something else (dehydration & bad eating is a common cause). You can also make an appt for a blood preg test and tell the doc what's going on with you.