Does taking birth control pills affect menstruation?

Patient's question:

I haven't gotten my period yet, and it was supposed to come on the 10th.
I had unprotected sex on the 7th or 8th and took emergency contraception afterward, taking two pills. On the 25th, I took a pregnancy test at the hospital, and it came back negative. But then on the 26th, I had another unprotected encounter. He said he didn't come, and I'm very worried—could I still be pregnant?
I want to take medication. What kind of medicine can help regulate my period?

Doctor's answer:

It is recommended to go to the hospital tomorrow to have a blood test for HCG or take morning urine for an early pregnancy test to determine if you are pregnant. Emergency contraception is only a temporary emergency measure and should not be used for regular contraception. Some women, who are unwilling to take birth control pills every day and also reluctant to use condoms, may use emergency contraception pills as a "magic weapon" and take them frequently. This practice is not acceptable. Firstly, emergency contraception is less effective than regular contraception; secondly, long-term and repeated use of birth control pills can be harmful to health, potentially causing menstrual disorders or heavy bleeding.

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