Gah I somehow did not see this yesterday!
Have an attempt right away if you didn't already. The trigger shot will ~probably~ prevent you from needing the e4d (although you can if you want to and it's not going to hurt anything - in the very slim chance O was delayed, which it usually isn't with the trigger, you'll be covered)
I would wait till after you know you've ovulated to take the Duphaston. CD 15 should be ok.

