Do I go from lmp or ovulation for due day

Jojo

So basically I ovulated and sexed on cd12. I have 26 day cycles and period is only 2 days. Had scan 2 days ago but they could only see sac and rebooked me for 2 weeks they only did scan abdominally not internal which I believe they would have been able to see inside the sac if the did. Below is my dates for both lmp and ovulation and my scan (sac is between yellow spots) let me know.

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