Within three days of taking progesterone, if you have sex without contraception, you may become pregnant.

Patient's question:

Two months ago and two weeks ago, there were two instances of sexual activity with emergency contraception, which resulted in a one-and-a-half-month delay in menstruation. A hospital ultrasound revealed no pregnancy, and the doctor prescribed progesterone to regulate the menstrual cycle.
I started taking it two days ago, but yesterday and today, there were two instances of unprotected sexual activity. Will I get pregnant? Isn’t progesterone a pregnancy hormone? Do I need to take emergency contraception?
First follow-up question: Yes, I know it’s not a contraceptive pill. I’m just wondering if this period of medication is relatively safe—is it true that menstruation will come if the medication is stopped?
Also, can I take emergency contraception? Will there be any conflicts? Emergency

Doctor's answer:

Hello: Progesterone is not a contraceptive pill. There is a possibility of pregnancy if there is sexual intercourse without contraception. If you do not want to get pregnant, you should take emergency measures. Generally, when taking progesterone, menstruation will occur 3-7 days after stopping the medication. Women need to be patient. If menstruation has not occurred by then, it means that the estrogen level in your body is too low, and you need to add estradiol. In the case of excluding pregnancy, usually, menstruation occurs 3 days after stopping oral medication. If menstruation has not occurred yet, you can switch to injecting progesterone after another week. The dosage is 40 mg of progesterone once, used for 3 days, and menstruation should occur 3 days after stopping the medication. If it still hasn't happened, you will need to check for other underlying causes.

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