Do I still have a chance? (Description)

I wasn’t feeling well earlier in my cycle so I didn’t start with my OPKs until CD 14. Usually I get my first light positive on CD 14 and then gets darker for the next 2 days.

However this month, the first time I tested on CD 14, it was already a DARK positive (leads me to believe it would have been positive for at least a day or 2 before).

We had sex on CD 14 (day of this dark positive, but probably not the first day of positive) but that’s it.

Was that too late? Do we still have a shot?