When the scan shows that your follicles have grown to the right size, you will be given a drug to mature the eggs within the follicles. This will prepare the eggs for the egg collection (step 5).
The name of the drug is Pregnyl. It works in the same way as the natural hormone “human chorionic gonadotropin” (or hCG for short). This drug matures the eggs inside your follicles and prepares them for collection.
Pregnyl needs to be given 36 hours before the egg collection procedure (see step 5) which means that it may need to be taken late at night. It is given by injection.