hi peacy,
Injection on day what depends on whether your're going for the short protocol or the long protocol...
I went for the short protocol, and I started my puregon selg jab on day 2 of my menses. Before that, i had contraceptive pills for 21 days, then period came, then D2 started puregon jabs.
Then after that is scan, jabs, scan, monitoring, jabs, scans etc...till your gynae confirms that you're ready for the egg retrieval. In between the jabs, the gyane may adjust your dosage, depending on your response.
If yours is a short protocol, and you've got any doubts, i can try to help...if you're going for a long protocol, i think there are a few sisters here who can help...