Calculation of pregnancy

I am a bit confused by the weeks calculation. As my LMP is 24 Jul 2019, so the app said I am 6 weeks pregnancy. However, when we saw gynae and did the ultrasound, it showed only week 4. Does that mean it grow v slowly? Are yours all same with what ultrasound showed?

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They can see thru ultrasound.. at first they say my due will be EDD 29/03/2020.. but when they see my baby size and even question me.. is my menses regular? My menses is irregular but come everymonth.. so they say in just afew days.. so my EDD is 3/04/2020.