For how to calculate pregnancy duration

Patient's question:

What I said, I was clearly menstruating on May 30th, but the doctor marked it as June 7th. Is it about ovulation? He said if my cycle is 28 days, it should be around June 20th, and if it's 30 days, it would be around June 22nd. I haven't had my last period until June 6th, and we had intercourse from June 15th to June 18th without breastfeeding. Then, on the 18th, I took birth control pills three days after intercourse. Since the child is developing normally, he said taking the pill on the 19th would be useless—had it taken effect, the child would have been miscarried. That’s what he said. Three days later, he asked me again if I had intercourse after taking the pill on the 19th. I said yes. Later, he said what I said was that I took the pill first, ovulated, and then got pregnant. So, was it already pregnant before June 18th, or did I get pregnant after taking the pill on the 19th and having intercourse again?

Doctor's answer:

Dear Inquirer,
Hello, and I’m glad to help you with your questions. If your last menstrual period was on May 30th, then it should be calculated as such. However, the doctor may have used June 7th based on ultrasound examination indicators. This is the full explanation for "When did I get pregnant?"
Finally, I wish the patient a speedy recovery and a healthy life.

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