Margie, sounds like you used the hCG as a trigger, correct? They had Sara H do the hCG booster because she triggered with Lupron. The nurse at Cooper told me the point in doing this is because the Lupron collapses the follicle and forces the egg out and that the hCG booster "triggers" the corpus luteum to develop and start producing the necessary luteal phase hormones. If not all your follicles releases with an hCG trigger they might have you try Lupron or something a little stronger to get you to release. That's why Sara H and I both use Lupron as a trigger - because hCG didn't cause us to release.