How to know really how many weeks of pregnancy?

Question

My last period started July 3, the app says I am on the 5 week but 5 weeks ago I had my period. Someone knows this?

Answer

Pregnancy is measured from the first day of your last period. Because nobody can tell you the exact moment conception happens, when they say you're 10 weeks, you're actually only about 8 weeks from conception. We only carry babies 38 weeks. But you're 40 weeks pregnant. So that sounds about right.

Answer

The only way you'll know is having an ultrasound before 12 weeks.

How to know really how many weeks of pregnancy?

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