Could sensitive abdomen and nausea indicate possible pregnancy on Depo?

The given ranges are the levels of HCG hormone in non-pregnant and pregnant females’ blood by gestational weeks, as per data. To ensure precise pregnancy confirmation, it is advised to visit the obstetrician-gynecologist and undergo a blood test. In all other cases concerning menopause, one should go to a gynecologist.

the test should be performed not sooner than a week after a missed period. But any abdominal pain or irregular bleeding should be immediate cause for alarm and you need to be evaluated by a gynecologist.
 

It's normal to have cycle length variations. Factors like stress affect cycle regularity. A 28-33 day cycle is still regular.. . See a doctor if bleeding is HEAVY or PAINFUL. 

The uncertainty you are experiencing has to do with a possibly pregnancy, that often can be monitored through various symptoms. Frequent puke and reflux are typical symptoms in pregnant women. In case of any doubt, take the pregnancy test. Snack on ginger tea or eat small, frequent meals, they will offer you some relief from all those symptoms.