How big is the fetus at 2 months of pregnancy

Patient's question:

I haven't had my period for three months, but I never paid much attention to it. Recently, when chatting with my best friend, she mentioned it and said, "Could you be pregnant?" Because my period has always been very regular. So, I went to the hospital for a check-up, and the results showed I was two and a half months pregnant.
What kind of help do I need: How big is the fetus at two months of pregnancy?

Doctor's answer:

The first month of fetal growth begins about 7-10 days after fertilization, when the fertilized egg implants into the uterine lining and starts developing by absorbing nutrients from the mother. During the first 8 weeks, it should be referred to as an embryo, not a fetus. By the end of the third week, the embryo is about 0.5-1.0 cm long and weighs less than 1 gram, but its external form can already be seen with the naked eye. On the outside, the embryo cannot clearly distinguish between the head and body, and it has gill arches and a tail, similar to the embryonic development of other animals.

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