how do I change how many weeks I am?

Melissa • ❤️🤰🏽💄💋
So I went to planned parenthood on Wednesday and they said I was 4 weeks and 1 day but the app says I'm barely 4 weeks and 1 day? Who should I believe lol. I have an appointment tomorrow but idk if they would even do a ultrasound yet!??
Help... 

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