Sex when period is already late

I have very regular periods, I had sex two days ago using the withdrawal method and I was already six days or so late on my period, now I'm 9 days, 9! My cycles are very long anyway around 34 days and now I'm on 42nd day. I'm very worried as it still hasn't come and I would get period symptoms like four days or so before and nothing! I honestly am not stressed at all I'm not taking anything hormonal does anyone know what could be going on? Please please help xx