When is a good time to go on maternity leave?

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I am just asking because I am pregnant and I plan on working up to the week before my due date. I had discussed the situation with my boss and let her know that I wasn't going to be able to come to work for at least three months and she reacted as though I was severely insane or something. I mean is this way too long to take time out of work? I mean the average time is the six weeks that you need in order to completely heal. For me the rest of the time is going to be for me to spend time with my new baby and to try and get some much needed relaxation while I am catered to my husband. Ladies and Fellas tell me what you think. Is this too long to take from work? How long did you wait before you went back to work?