Today is 9/10.. and if you think you had a +OPK on 9/2 -- you usually don't ovulate till 24-48 hours after the positive OPK.
+OPK = surge for ovulation to occur in 24-48 hours.
+OPK does not = ovulation that day (in most cases, never say never).
So, one can assume you possibly ovulated on 9/3-9/4 which is 6-7 days ago.
With all that said, it could be. It could not be.
I would not test this early. I would wait a few more days. And remember, you are not out the game until AF shows up!