Is it pregnancy or a side effect of birth control pills?

Patient's question:

On November 25th, I took emergency contraception. On December 1st, my period arrived (exactly on the seventh day). The flow of my period was a bit less than usual, but it wasn't too much or too little, and the color was normal. Usually, my period should have come around the first of the month, but it hasn't arrived yet by the 11th. Lately, I've had some lower abdominal pain, and my discharge hasn't changed much—no nausea or vomiting. Could this be pregnancy or a side effect of the emergency contraception?

Doctor's answer:

You have had a delayed menstrual period for a relatively long time. You can use a pregnancy test kit to check. If the test kit shows two red lines, it means you are pregnant. If there is only one red line, it can be ruled out as pregnancy, possibly due to menstrual irregularities or side effects of emergency contraception pills. It is recommended to go to the hospital for an ultrasound examination and take blood-activating and menstrual-regulating medication. Since you have taken contraception pills before, it is considered that the menstrual disorder may be caused by the contraception pills. It is suggested that you should go to the hospital for an ultrasound examination to check the condition of the uterus and bilateral adnexa.

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