Any HR professionals on this board?

I was wondering if any of you could help or at least point me in the right direction.

I work in the entertainment (TV & Film) industry which can have somewhat confusing employment practices.  So I have been with my current company for 2 years this fall.  There is no HR person at my company.  I am on a contract basis, my first year was a full year contract, I was renewed for another 9 months.  Basically if my company knows they are getting more work they renew my contract.  My contract is going to end when I'm about 5 months pregnant. 

I guess since there is no HR here, I'm confused as to what if any legal rights I have.  Because I'm contract based can they just decide not to renew me because I'm pregnant but say its for other reasons?  Does FMLA still cover me? (there are more than 50 employees here but I believe everyone except maybe the very top is on a contract basis) Last time around I had an HR rep who went through the companies policies here, at my current position I doubt anyone in the company even knows what they can or cannot do.

Any help would be totally appreciated, thanks!