Referring to the data you provided (not having menstrual period after taking one shot of Depo Provera (generic name: medroxyprogesterone), spotting before two weeks only for two days), you might be experiencing menstrual irregularities as a side effect of medroxyprogesteron. Menstrual irregularities might range from amenorrhea to unusual bleeding (or both). Other side effects might include: weight changes, dizziness and headache.
The spotting for only two days might have been your menstrual period changed under the influence of medroxyprogesteron.
You might want to visit your gynecologist for a physical examination and hormonal laboratory tests. Checking for pregnancy is advised, too, because the data that were given are not sufficient to either confirm or rule out pregnancy, and certain hormones (which might be recommended to treat the hormonal imbalance) are not supposed to be taken in pregnancy.
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