What he has said is harrassment on the basis of pregnancy. Have you documented the dates that these things were said to you and do you have any witnesses to any of the conversations who could back you up?

If you were fired for 'miscionduct' do they have any evidence for the misconduct allegations? If not and you are claiming it is on the grounds that you are pregnant then it is unlawful dismissal which is much more serious than unfair dismissal.

I would contact the Human Rights and Equal Opportunities Commission to make a formal complaint asap.