Aloha Marina_Butala,
Here are some initial things to concider:
Pregnancy
In the Level One course you hear him recomending not to do the heel raises in the Harvesting of Qi, or the Seven Steps of New Life. Everyone is a little different, so you may find that you can comfortably only do the sitting meditations. My wife actually found the Seven Step was the only exercise (other than the mediations that she could do).
Menstration
The Breast Massage found in Level Two, not only helps with menopause, it will help with problems with periods. The flow period will be shorter and you will detoxify faster. You must focus your energy in the heart. This can even help after hysterectomy.
Much Love,
Shawn