How far along are you?

Brittany • 27. Finally got my BFP after 11 cycles of TTC by using the SMEP, Preseed, and a whole lot of prayers!!
I'm trying to figure out if I should calculate my estimated due date based off my last missed period or based off the day I ovulated? I have an average 32 day cycle so using my last missed period makes it look like I conceived before I actually ovulated. 
I don't see my dr until November 18th to confirm and check everything. So I know it could change based on how the baby is measuring but I didn't know what due date I should put in my <a href="https://play.google.com/store/apps/details?id=com.glow.android.nurture">pregnancy apps</a>. Thoughts?