Had sex on saturday ovulation started today if intake the pill tomorrow will it still work? please let me know

Use pill morning aft: The "morning after pill" is effective, but not fool-proof when used within hours of having sex. When used several days later, fertilization may well have already occurred, even if you believe you have just ovulated. Days later a fertilized egg may already be implanted. Ovulation does not always occur on exactly Day 14, but usually occurs within a window of a day or two surrounding the 14th day.