Job hunting while pregnant

I have been job hunting my entire pregnancy and at 13 weeks pregnant I was offered a job. I accepted the offer and disclosed my pregnancy and the employer told me I was no longer suitable for the position. I then got offered a job this passed week at 21 weeks pregnant. I accepted the position and disclosed the pregnancy and once again they told me they were unable to accommodate my pregnancy. I am still actively seeking employment but does anyone have advice on what to do if I am lucky enough to have a third opportunity come up? I was trying to be honest with the employer to start out on the right foot and just ended up getting burned in the end!!

How should I move forward? I live in Ontario and have until 13 weeks before my due date to start a new job in order to qualify for maternity leave.