How long is the effectiveness of taking birth control pills?

Patient's question:

Medical Description: I started taking birth control pills on the 8th of this month, and they come in packs of one pill every 72 hours. However, on the 13th, I had sex with a boy, and he is a virgin. He started to orgasm before he even entered me, and it seemed like he might have cum outside. Later, we both washed up, and he never actually entered me—just moved outside. I’m still worried about getting pregnant. I’ve only been taking the pills for the past five days. Do I still need to take them? We weren’t in a safe period, so I’m worried. I’m just certain he didn’t touch me when he orgasmed. It was always outside, he never entered.
History of Treatment and Effect: I’m very worried. Is there a problem?
Help Needed: Can I get pregnant in this situation? Do I need to take medication?

Doctor's answer:

It's dangerous. Based on this calculation, she is currently nearing her ovulation period, making it very easy to get pregnant. The effectiveness of birth control pills lasts for up to 72 hours. If you haven't taken any measures during these few instances, then you'll have to leave it to fate. If you didn't take any precautions on the last day, you could try taking a pill. Under normal circumstances, it's common for menstruation to be a few days early or late. Such situations usually do not lead to pregnancy. If you're not sure, you can use a pregnancy test kit to check. Additionally, taking emergency contraception pills may cause irregular menstruation. In such cases, medication is generally not necessary. It will gradually return to normal on its own.

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