Here you go hun http://www.tommys.org/Page.aspx?pid=275 I think it might be because some people say you're in your 14th week when you're 13 weeks. Not that I understand it, but all my apps say 13 weeks except one, which has the same dates but says I'm in the 14th week. Confusing!!!
I think it's like olive says. You are 13 weeks pregnant and in your 14th week of pregnancy. Just like we are living in the 21st century even though it's not year 2100 yet, so I think you better get over to tri 2!
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