Evaluations and appraisals should always be based on your official, written job description. It is the only objective way to measure whether you are fulfilling your job duties or not.
Do you have a copy of your job description? If not, can you obtain a copy? Does the job description state that your employer is responsible for providing you with job training? Are there parts of your job which are dependent on receiving assignments from your boss or others in the office?
You need a copy of your job description. If one does not exist, I would sit down and write out what you think your job description would be, based on what you were told at time of hiring. Then figure out where you stack up against this description.
If there are any areas in which you are not fulfilling the job requirements, make a note of why not. I would include verbatim any comments you're received such as "There's no point in training you because you're just going to get pregnant and leave anyway."
When your boss goes over this with you, I would demand that he disqualify scores from any area in which someone else in the office was responsible for giving you training or assignments and refused to do so. DO NOT SIGN the eval until you have amended it with a written explanation of the areas where you disagree with the score. Insist on a photocopy of the entire eval, including his sig, your sig, date and your additional comments.
I highly recommend that you review federal and state statutes concerning sexual harassment and discrimination. Isn't this the same place where they were out-and-out harassing you a few months ago? A few casually dropped references to "hostile work environment" might make him stand up straight and wipe the smirk off his face.
Because this job is just a stepping-stone for you, it's an excellent way to practice your assertiveness skills re: HR issues. They'll serve you well in the future. Good luck and keep us posted!