Help please ladies !

Can someone help me with dating?? I am trying to figure something out. The only time I had sex was November 15. Now if I had ovulated late and implanted late what could be the absolute earliest I am in weeks? I am
Trying to figure this out because transvaginal ultrasound lastnight only saw a gestational and yolk sac and no pole ... I am trying to figure out if I could be too early??? If I go by my "LMP" I am 6w4d and I know a pole should have been seen .. But if I go from when I had sex and possibly ovulation a few days after that I could be around 5 weeks I think .. Can anyone do the math??? Thanks so much 

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