Timing SI is timing sexual intercourse which is relative to ovulation day. This method is suitable for young couple who has ability to pregnant naturally. It can perform in both of natural cycle or egg stimulation cycle.

Timing SI in natural cycle:
To find the best time for having sexual intercourse in natural cycle, this treatment will observe the egg by performing transvaginal ultrasound scan in the mid of cycle. Once the size is reaching the state of ovulation then apply the injection to trigger ovulation.

Timing SI in stimulation cycle:
This method uses oral medicine from day 2 or 3 of period and sometime combine with additional injection after finished oral medicine to stimulate the eggs and observe the growing egg follicles by transvaginal ultrasound scan in the mid of cycle for trigger ovulation.