which week i should follow

hello mummies,,yesterday I went to hosp to inform doc that I already pregnant..actually I on treatment for infertility and I already pregnant before start any treatment..???..then doc ask me to scan and she said it was 4 week..but if I use the pregnancy apps counting by my last period it is already 6 week...this is my first baby and I just curious which one I should follow. tq

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sya pun period tak teratur...first scan doc ckp bru 7 weeks..tp ikut apps bby dh 9 weeks