Patient's question:
However, this method of determining ovulation isn't always accurate. Generally, ovulation occurs about 14 days before the next menstrual period. If your last menstrual period was June 7th, and you have a 28-day cycle, your ovulation period would likely be around the 20th. If your cycle is 30 days, it would be around the 22nd.Taking birth control pills on the 19th would be ineffective. If you were still able to conceive and the embryo developed normally, it means the birth control pills didn't work. If they had, the pregnancy would have been terminated.
I had a pelvic ultrasound on July 13th, and my last menstrual period was May 30th. In the message I sent earlier, I mentioned whether the pregnancy occurred before or after taking birth control pills. Please clarify my question. I don't need to hear about birth control pills—I already understand that part. I just want a kind doctor to help me interpret this statement. Thank you.
Doctor's answer:
Based on your description and the detailed ultrasound results you provided, it is suspected that you became pregnant before taking emergency contraception. The ovulation day is approximately 14 days before the next menstrual period. The fertile window is four days before and three days after the menopause. Your last menstrual period was on May 30th. If you count back 14 days, June 16th would be your ovulation day. Wishing the patient a speedy recovery, a healthy body, and a wonderful life.