Once the egg has reached optimal development, a trigger shot is administered, causing ovulation within 36-42 hours. The trigger shot has human chorionic gonadotropin (hCG), a hormone that signals the follicles to rupture and release an egg.

Does ovulation guarantee after trigger shot?

Ovulation generally happens about 36 to 40 hours after administering a trigger shot. Since the shot is used differently in IUI and IVF, this means that the timing of the shot is important in relation to the other procedures you're having.

Can you test for ovulation after trigger shot?

Appropriately-timed HCG injection ensures ovulation approximately 36-40 hours later, and enables perfectly timed intercourse or insemination. Please note that HCG injections will cause ovulation, but your pituitary will not release LH (positive urine ovulation test), so do not test ovulation when using HCG injections.