Rominka, ovo sam skinula sa stranice svoje bolnice:

hCG-injection
Sometimes the progesterone treatment is replaced or supported by the administration of hCG during the first week after transfer. This pregnancy hormone stimulates the production of progesterone in the body itself.
If it is prescribed, you will have
either one injection of 5,000 units,
or a dose of 1,500 units every day on three different days.
The choice of administration depends on the results of the hormonal blood tests.


http://www.brusselsivf.be/preparing-...l=true#L4-6189