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When did you start feeling those symptoms?
Do you have vomiting or nausea only?
Did you consult doctor?
Sickness or nausea can occur in early pregnancy.
This can cause tired feeling.
Tired feeling can also come from anemia.
Vitamin, iron deficiencies can be associated with hair loss.
Are you taking prenatal vitamins?
Did you have blood tests, hemoglobin level?
Hair can be thicker from hormones, but if there is any deficiency state then this can cause hair loss.
Yes, doctor can review those.
You are also feeling tired.
Please try to take plenty of fresh fruits, vegetables.
In pregnancy, anemia can occur.
Fresh fruits, vegetables would provide vitamins, minerals naturally.
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It is pregnancy category C drug.
There is no adequate study in human but have been seen to cause harm in animal study.
It is not clear whether there would be harm but you need to have regular check ups, ultrasound studies.