Bisha,
First, congratulations on your pregnancy. Yes you are correct with the 6 - week timeframe. Depending on the company, they are required by law to keep your job, however, the longer you are out, your role could change when you come back (bummer).
I think the most direct thing to do is call your outsourced maternity leave customer service line and ask them specific questions and also your HR department. They should know this information cold. Sorry this did not directly answer your question but between those two, you should find out what you need.