On or after the day of your retrieval, and before the embryo transfer, you'll start giving yourself progesterone supplements. Usually, the progesterone during IVF treatment is given as an intramuscular self-injection as progesterone in oil. (More shots!) Sometimes, though, progesterone supplementation can be taken as a pill, vaginal gel or vaginal suppository.
Besides the progesterone, there really isn't much going on for the next two weeks. In some ways, the two weeks after the transfer may be more difficult emotionally than the two weeks of treatment. During the previous steps, you will have visited your doctor perhaps every other day. Now, after transfer, there will be a sudden lull in activity.