Sure, you can sue anyone. First though, find a new doctor who can treat you and make you well again. Find a therapist to help you with your loss. Then determine whether or not treating your hyperthyroidism while pregnant was safe. I am not an expert but it might have been a case of damned if you do, damned if you don't. When you have done all of the research then decide whether or not you should talk to a lawyer. He was cold and un-feeling. Suing him won't bring your baby back.
I agree with Barb - you would need to find an attorney group that specializes in medical malpractice. Just be aware that the attorneys that defend doctors are monsters and will try to prove that the placenta abruptio was unrelated to the hyperthyroid condition. There are some firms that will represent you and take their cut after a verdict is rendered in the plaintiff's favor.
If you go this route, I hope you have kept very good notes of the conversations and comments made and get all of your medical records together as evidence. It can take several years for cases like this to reach a final verdict from a court of law. (at least in the USA) The delay is in hoping that you will voluntarily dismiss - just to move on with your life despite the gross injustice.
I'd first file a complaint with whatever medical "board" that governs physician's actions. They are obligated to investigate - it doesn't cost anything to do and you will hve some retribution. However, there is a drawback. If word gets out that you've filed an ethics complaint - the medical community is pretty close knit - other doctors might be afraid to take you on as a patient.
I know. I work in an attorney's office.
My heart aches for what you have had to endure.
In the meantime, I pray you have found someone else to treat your hyperthyroid condition.
I'm very sorry for your loss, and find your doctor's attitude totally disgusting.
You should get an attorney who knows medical issues to determine if you have grounds for a law suit. I don't know how hard it is to win a medical malpractice suit in Canada. Your doctor should have known how important your thyroid health is for your baby's development.
How heartless. I'm so sorry for your loss. I hope someone with knowledge of the law will come to your aid. Many blessings.