It only takes the egg between 12 and 24 hours to make its way through the fallopian tube after ovulation. The sperms survive much longer for nearly 3-5 days in the cervical crypts. The best chance of conception comes when a couple have intercourse one to two days before ovulation.

A woman typically ovulates 14 days before her period and so if a woman has a 28 day cycle she would ovulate on the 14th day. However if the cycles are irregular the the exact timing of ovulation is difficult to determine. hence the best chance of conception is by having intercourse around mid-cycle. Generally it is a good idea to have intercourse every alternate day from the 10th to the 16th or 18th day of the cycle if the periods are regular. best chance of conception will be.

Some women know when they are ovulating from changes in their body and the way they feel. Some typical indicators are breast soreness, heavier and more opaque vaginal discharge, tightness in the abdomen. Many others will have have no symptoms.
Basal Body Temperature ( BBT )

Two days after ovulation, your temperature rises slightly. While this is not useful for that particular cycle, taking your temperature every morning before you get out of bed is an easy way to chart your cycle. Track the rises in BBT for a few months to work out how regular your cycle is and use this to predict the date of your ovulation. If your tracking indicates that your cycle is irregular, try counting back 11 days from your longest cycle and 17 days from your shortest cycle. The days in between will be your most fertile.

Regular Intercourse

Knowing that sperm can survive inside a woman for a number of days, if a couple is having regular sex (two to three times a week) there is a good chance that there will be some sperm there to meet your egg when it arrives. Like mentioned before having regular intercourse every alternate day starting from the 10th day of the cycle is a good idea.