Spring- I had my orientation on Thursday and actually asked a similar question. I wanted to know what was the difference between the progesterone gel and the HCG injections. THe reply was even though they are different, they are there to boost a possible pregnancy. I was told they are not necessary as our body also produces the required hormones. She said some doctors include it in their protocol and others don't. If it was me I would use what I had and wait for the call on Monday. HTH