confused on due date?

Alexis
Thoughts on which would be my due date?
Last period: sept 11th
Back in June I tracked and tested positive for ovulation around day 19 (haven't tested since that month)
Cycles are 36 days long
Going by last period due date is June 18th
Going by last period and taking in consideration of long cycles possibly later ovulation I'm coming up with June 26th
Help?!? 

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