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He will go by LMP and schedule a dating ultrasound to confirm dates. U can tell him when u think u ovulated but he'll most likely brush it off and stick with LMP.

They will initially go my LMP, but most of the time they will figure from the ultrasound

My dr went with my lmp even though I know I ov'd late. My lmp gives me a due date 5 days sooner than my baby measured, but she said if two dates are within 5 days of one another, they default to lmp because a due date isn't ever exact, anyway. Had there been a greater discrepancy in dates, they would've used the baby's measurement.

if you are 13 dpo and know when you ovulated you can calculate the due date as if your baby was born on a cycle of standard 28 days, so minus 14 days from your o. the due date should be maximum 5 days more or less from the day that results from this method of calculation. even women with 28 days cycle don't know exactly the due date. only 5% of women actually have their baby on due date. You could have your baby even after more than 5 days after your due date on a normal cycle.