When does pregnancy occur, before or after the menstrual period?

Patient's question:

Was it before or after your period that you got pregnant? My last period started on the afternoon of June 14th and lasted for six days. On the seventh day, it stopped. I was with my ex-boyfriend on June 10th, and with my husband on June 12th, 13th, and after my period ended. My last period on June 14th, but I only found out I was pregnant on August 9th. On September 19th, the NT test showed the fetus was 12 weeks and 5 days. On December 6th, the 4D ultrasound showed the fetus was 22 weeks and 2 days. Who is the child? Why does the fetus seem to be growing two to three weeks smaller with each check-up?

Doctor's answer:

According to your description, the conception time was after the menstrual period on June 14th. Recommendation: Under normal circumstances, it is normal for the fetus to be two weeks smaller or larger than the expected gestational age. The subsequent color Doppler ultrasound showed that the gestational age reflected normal fetal growth and development.
The above is the recommendation for the question "Is pregnancy before or after the menstrual period?" I hope it helps you. Wishing you good health!

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