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The problem with going by 4 weeks being in a month is that 40 weeks breaks down into 10 months. So an easier way to do it is to go by the date you are due. I'm due 3/30/11 so the 30th of each month it adds a month. So I'll be 5 months on the 30th of this month. If I go by weeks I'll be 5 months on Wednesday. I find it very confusing to say the least. Good luck and hope that helps. :)
I always go by weeks. Most doctors now tell you that pregnancy is actually 10 months, not the 9 months that our parents went by, because it breaks the "months" down into 4 weeks. There's a ticker at the top that if you click on your week, it tells you how far along you are.