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In young women ( who are having monthly bleeds) endometrial thickness vary throughout the month. It is thin after the periods & thick just before the periods. So, best time for you to have a trans-vaginal scan is just after your periods. If thickness is normal at this time you certainly don't need any fractional curettage. As, this test is not usually recommended in women less than 40 years of age.
If endometrium is very thick & irregular even after periods, you have irregular bleeding or inter-menstrual bleeding
you may need a hysteroscopy
+/- endometrial biopsy
which can be done in an out patient department.
However, this is a general advise. I don't know your case better than your treating doctor. So, I recommend you to take a second opinion
from a specialist Gynecologist.