Help! Need Advice!

Ciara
Hi ladies, 
Have been TTC for four months - I know, not a long time compared to some - but my periods have ALWAYS been regular. To the day. So, when my period didn't show up last week, I was completely shocked - as I have convinced myself each month that I'm not pregnant so I don't get my hopes up. 
Well, I'm a week late and still nothing. Have been spotting every 2 days or so - very light pink. Once again, something I'm not used to. I've taken two pregnancy tests and gotten BFNs. Am I testing too early? Is it crazy for me to visit the doctor to make sure?