Need advice, please :)

Helen
I just need to process this and throw out some ideas... 
I'm currently 6 days late, still no positive home test. I'm weary as last month I was 5 days late but eventually got my period. I've been off bc for about 10 months and before this my cycle was like clock-work- not even a day late, once. I'm nervous that perhaps my cycle has been upset by something (other than a much prayed for pregnancy) thoughts?