Help finding due date

Anyeliczabell
I want to know an accurate due date since I don't have one. 
Last period : June 11th
Intercourse : June 27th
Missed period : July 14th
Average cycle : 26 days
Average period length : 7 days
On August 2nd doc said I was 6 weeks
But I was never given a due date. 
I think my due date is March 26/29th