Is birth control female hormones?
Answers: Yes. It is estrogen and progesterone. .
Yes... some are synthetic, and some of them come from pregnant horses. (See: http://en.wikipedia.org/wiki/Premarin )
If you're thinking of using them to help you be more female than male, it won't work: you need a lot more hormones than just a couple to manage the things needed for a sex-reassignment..
Yes, they are synthetic female hormones.