Hi, and thanks for your medical question on eHealth forum
Usually on depot preparations pregnancy does not occur. However take a blood pregnancy test and see if it is positive. HPV will not cause cramps, bloating, nausea, cravings, etc.
These symptoms could however be seen in a severe bout of acidity that comes and goes. GERD or acid reflux, IBS and hiatal hernia are also the possibilities. It could also be intolerance to certain types of food like gluten, lactose, citrus fruits, egg, sea food etc.
Please consult your doctor and get yourself examined as a confirmed diagnosis cannot be given on net. Hope this helps. Take care!