What's going on with me..! :-D

Ok ladies...this may be a long shot.. But before I get all excited and call the dr about what could possibly be going on I thought I'd get a little advice from you girls! Anyhow... I am now 9 days away from my period. I had *light* spotting starting yesterday and still have it today. It's very very light. I thought I was having tiny cramps (to be honest I don't even know if I was having cramps or telling myself I was lol) and I BD the day my fertile cycle started. How do I know if this is a sign of pregnancy? I've never had spotting and never have had an irregular period. I woke up this morning with a severe headache but other than that no symptoms at all.