It's easy for others here to be cool headed (because this didn't happen to them) but if this is true you should be angry lol.

If you suspect your supervisor is stealing work, discriminating against you (different rules), or was responsible (even partly) for your miscarriage you should get legal counsel and do whatever you can to get rid of him. He should not be able to keep his job if this story is true. Maybe it's because I'm from the U.S., but here this guy would have already been hit with a big lawsuit.