How accurate are these apps?!

Molly

I’m so confused, I tested positive last week and from my calculations I am 5 weeks today, my last period was on 13/07/21 however this app is saying I’m 4W + 2, I’m so confused! Am I just working this out wrong😂

Also even more confused because Glow (which I was using when TTC) says I’m 5 weeks exactly🤷‍♀️

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