I would advise that you see your doctor for a diagnosis.
As your tummy is bloated and feels hard and uncomfortable this could be related to womb problems, bowel or gastric problems.
You do not say if you are constipated.
May sure you drink plenty of water and have a healthy diet with fresh fruit and veg.
Best wishes.
Has this happened suddenly or over time? Is your belly soft or does it feel hard? Please see your doctor about this, as it could be one of several things, all of which require professional treatment. God bless - Blu