I am 33 weeks pregnant and I have a hard time with this as well. My understanding is that I am in my 8th month of pregnancy but am just over 7 and a half months pregnant. I could be totally wrong but that makes more sense to me as I still have a month and a half to go and we are only pregnant for just over 9 months.
I just take my due date and use that to say how many months I am. So let's say you're due Oct 21, then at sept 21 you are 8 months. At Aug 21 you were 7 months. Etc. Make sense? All months have more than 28 days so you can't go by every 4 weeks. :)
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