How to calculate weeks of baby

How to calculate how many weeks pregnant am i? I heard it should be based on my last period? I started my last period on 8th decemeber and ended the period around 13th decemeber with no more discharge. I tried conceiving between the peroid of 22nd december to 27th december.

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Can count based on your LMP but it will not be accurate. It's also how doctors count before you make your 1st antenatal appointment. That's why your 1st antenatal visit will have ultrasound so you base your pregnancy week by that.