Is the gestational sac at 42 days with a size of 407 square?

Patient's question:

Condition Description: 42 days after BC check, the gestational sac size is 107. Past treatment history and effectiveness: Natural conception. What kind of help do you want: Is the answer square or round?

Doctor's answer:

From your description, it seems your menstrual cycle is very regular. If it arrived on October 25th, your ovulation period should be around November 1st. You are currently at most 35 days pregnant. A vaginal ultrasound may still be able to detect a gestational sac, while an abdominal ultrasound can only clearly confirm it around day 38. Therefore, you can wait another week to have an ultrasound. If you experience abdominal pain or vaginal bleeding during this time, you should go to the hospital for an ultrasound immediately to rule out ectopic pregnancy.
The size of your abdomen is what you feel, because during this period, the uterus only slightly enlarges. A normal, non-pregnant uterus is only about 7-8 cm long, the size of an egg. At 2 months pregnant, it's the size of a duck egg, and at 3 months, it's the size of a fist. So, there haven't been significant changes externally yet. However, early pregnancy can bring pregnancy symptoms, such as bloating and mild nausea, which is why you might feel your abdomen is larger. This is completely normal.

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