It depends on when you catch the LH surge on your OPK. If you catch the trail end (but still getting a +), you could O within several hours, likely in the same day. If you got a + OPK today though, I'd say it's more likely that you'd O tomorrow though. There's a small chance it could be tonight, but since OPKs test for the
surge, you'd likely get a negative once you're actually ovulating.
Good luck & I agree with April.. I think you got in some good BDing for this cycle!