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At the time of ovulation the egg will be located in the fallopian tube. During the next few days it will travel down the tube and implant into the lining of the uterus - usually by around five days after conception. Until the fertilised egg implants, any hormone produced will not be detectable in the mothers circulation.

Over the next week or so the amount of hormone released by the newly fertilised egg will increase, and the circulation between the pregnancy and the uterus gradually develops.

These factors mean that it does take a certain amount of time before you can do any tests to see if you are pregnant. Urine pregnancy tests can sometimes be positive a few days before your missed period - so around a fortnight after conception. Sensitive blood tests can detect pregnancy a bit earlier than this.

It would be unusual for any of the symptoms of pregnancy to come on much earlier than this, mainly because they are hormone-related. Many women however 'just know' they are pregnant and I guess at the moment science cannot explain this - women's intuition perhaps!

So, I'm afraid that the short answer is no. In any case, it is not that easy to be consistently certain about the day of ovulation.