Anyone encounter this before ? Is it normal?

So i went to GP to confirm my pregnancy and according to my first day of last menses, doc say i am at coming to 6weeks of pregnancy. I went back to polyclinic to get a referral letter cause GP can only refer to private and i wanted subsidise. About 1 week (i shld ardy be at my 7wks right?) later kkh call for appt, went for my first ultrasound and then see doctor. Doctor say i am not even 7wks, i am only about 5.5 wks. Doctor assured everything is fine cause got baby heartbeat ardy. Should i be concern? According to my calculations & the GP doc calculation is tally. Anyone experience this before?

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1.5 weeks descrepancy is unusual. But out of the two, the ultrasound one is more reliable. I am 2nd trimester currently. My EDD given by KKH is 4 days earlier than my calculation based on last menses.

Normal and no need to worry cos usually your LMP is inaccurate that's why our EDD is based on our ultrasound. So follow the date & week based on your ultrasound.