When to test for a BFP

Hey ladies! This is my first month ttc with my husband. We are extremely excited but anxious. We are using preseed and opt. When should I test for the BFP? Af is due on the 31, and that is the first day of our nine day Disney vacation! It would be so exciting to know before, but I don't want to test too soon. I took an ovulation test this morning and it is go time! Thanks for any and all advice!