Help me

I am currently around 41 days late on my period. My last period was in September, and I completely missed the one for October. I have protected sex with a condom and I have even taken the pill. I have taken two pregnancy test at-least a week apart from each other and they have both been completely negative, with no faint lines. Should I be worried that something is going on, besides pregnancy? Or could I just not be showing signs of pregnancy yet?