On implanon,obese,7negative pregnancy tests,bottom and top of stomach is hard, movement in stomach..no pregnancy symptoms,bloated.what could be wrong?

Stomach hardness: Could be related to constipation, reflux, gallbladder, or ovarian pathology. A sonogram could check for pregnancy and ovarian/uterine pathology ,a plain abdominal film would assess constipation. Consider a trial of milk of magnesia (magnesium hydroxide) for 3 days and see if there is result and change.Follow up with a doctor/urgent care this week