I'm ready to be impregnated, but...?

I've agreed to be a surrogate for a gay male couple, and we've got a contract drawn up, and ran all the blood work, and we plan on getting me impregnated soon. I understand that he feels having with a woman distasteful, but he has been really unpleasant with me since we've reached the point of actual impregnation. He has been thoughtful and kind up to this point but now his attitude is almost misogynistic. I'm wondering if I should call off the whole deal right now, and get out before we sign off on the contract. His partner outright dislikes me, and has done from the first meeting, and is openly rude and offensive to me at every opportunity, and now I think its rubbing off on the would be dad. Should I go ahead with this........?