A cyst is usually left over from when the ovary released an egg. It's usually filled with fluid. Sometimes, the cysts become active and produce estrogen. Sometimes they don't do anything at all.
The Lupron causes a surge in estrogen when you first start to take it. After a few days, it starts to decrease estrogen production. If you have a cyst that's producing estrogen, it keeps the Lupron from doing it's job.
If the cyst is not producing estrogen, you can continue on with the cycle. They usually go away or get squished by the other follies (follicles).
To start stims, you're estrogen or estradiol should be less than 50.
Hope you liked my less than technical explanation. It's hard to explain to people who don't know what all of this stuff is. IF has taught me a lot.
