The probability of achieving a pregnancy is highest when intercourse occurs on the peak/ovulation day. Published probabilities range from
0.10 when intercourse occurs six days before ovulation to 0.33 when it occurs on the day of ovulation itself10.
Timing intercourse with ovulation is also advantageous in determining whether investigation for subfertility may be required earlier,
or otherwise delayed to give the couple the opportunity to try for optimum timing.
Knowing when the fertile time is occurring also allows couple to be able to plan to be together, particularly around ovulation.
Also, be aware that regular intercourse every 2-3 days has disadvantages such as interference with travel or work commitments, additional
stress of 'being available'. This is especially so if the woman’s cycle is long or irregular and without necessarily knowing if
each act of intercourse is during an infertile or fertile time.