6 days late

pls. someone help me. im scared... im 6 days late.. my usual cycle is 30-37 days and im on my 40 days cycle. i only had 1 sex this month... that is 5th of dec. end of my fertile. i should have my period this dec.17 but it did not come. i know we did safe method.. and i saw it ? pls. someone explain whats happening? i havnt taken a pt. im hoping it will come before dec. ends im working here abroad ..i dont know what to do. i search some signs of pregnancy but nothing match to me except late period. pls. help im scared..😢😞