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There is 4 weeks in a month, so if you are 2 months pregnant, you are 8 weeks. As long as you know how to add you can figure that out. I'm 8 weeks and 1 day today soooo excited! :)
Another thing is, if you know what day your weeks start on you can always keep track of how far along you are in weeks. For example mine starts on Wednesday, so every Wednesday I am one more week along.
If you go by the "4 weeks in a month" there are 10 months of pregnancy. Technically, there are 4.3 weeks in a month, which is why it's a little tricky to figure out. When you're pregnant, don't worry about the months. (Or if you really want to know, count it out on a calendar.) Just go by weeks, since that's what everyone does.