Patient's question:
Hello: My girlfriend had her period on October 15th. She took emergency contraception on the 10th of this month, but she hasn't had her period yet. It should have come around the 15th of this month! This morning, I tested with a pregnancy test and it was negative. The day before yesterday and the four days before that, the tests were also negative. Could it be possible that it showed negative because of an ectopic pregnancy? Is it possible that she is already pregnant but the test still can't detect it!! Please help with a consultation!~~ If possible, could you leave your phone number and a general time when you can answer the call so I can consult?Doctor's answer:
Hello, the working principle of an early pregnancy test strip is to detect the level of HCG (human chorionic gonadotropin) in the urine. This hormone is secreted by the embryo, so as long as you are pregnant, the hormone levels in both the blood and urine will rise. We can use this to detect early pregnancy.Another condition is ectopic pregnancy, where the embryo implants outside the uterus. The most common type is fallopian tube ectopic pregnancy. Although it is ectopic, it still secretes HCG. Therefore, even with ectopic pregnancy, an early pregnancy test strip can detect pregnancy.
If the early pregnancy test strip is negative, the possibility of pregnancy is very, very low. Since you have lower right abdominal pain, I recommend going to the hospital for an ultrasound to find the cause.