How long does it take to discover an ectopic pregnancy?

Patient's question:

Recently, I saw news about ectopic pregnancy and near-death situations, and so on. My boyfriend and I had sex again two weeks ago without using a condom. I've always been quite unlucky, and I'm very worried that ectopic pregnancy might happen to me.
Hello, how long does it usually take to discover ectopic pregnancy? What preventive measures can be taken?

Doctor's answer:

Hello, I am very happy to help you solve your problem. In most cases, after confirming pregnancy, it is necessary to closely monitor the doubling of human chorionic gonadotropin (hCG) levels. Under normal circumstances, the average time for the intrauterine early pregnancy indicator to double is 2.7 days. If during a three-day check, the doubling of this indicator is poor and no gestational sac is observed in the uterine cavity, ectopic pregnancy can usually be detected after 35 days of pregnancy.

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