How to determine if there is a problem with the fetus in the early stages of pregnancy

Patient's question:

Now it has been 44 days since HY.
Can I take pregnancy formula milk, comprehensive vitamins (e.g., Materna), and calcium supplements (Diqiao) simultaneously? Will it lead to nutritional excess?
If I take a long-distance bus ride for 3~5 hours, will it be a problem?
How can I determine if it's ectopic or intrauterine?
When I went to the hospital for a check-up, the doctor just told me to come back in three months for a check-up and to register, and didn't do any tests.
First follow-up question: But I heard that doing an ultrasound is harmful to the fetus. What should I do then?
Is it okay to do it this early?

Doctor's answer:

Okay, here is the translation following your instructions:
An ultrasound is all that's needed.
First, you need to maintain a positive and optimistic attitude.

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