The exact same thing happened to me (one time DTD, 5 days before OV) and now I am due in 6 weeks.
This is my second pregnancy, I had our son when I was just 18. Fast forward to now, twenty years later and I have to say, that even though I am now so much older, this pregnancy is better in every single way! I have not been sick once (suffered the whole way through last time) blood pressure is normal (was induced last time due to it being high from 2nd tri onwards) and I feel just great! So it just goes to show that younger is not always better ladies!
Good luck and I hope you all soon get your much longed for BFP x