The uterus has now crossed the belly button and is pushing the stomach upwards towards the ribs. This may cause you some heartburn or acidity.
You can ask your doctor to prescribe antacids for relief. Continue to eat small meals and avoid fried stuff as heavy and oily food is the main cause of acidity.
As the uterus grows, it will create pressure on the rectum too, causing blood vessels around the area to swell and manifest as haemorrhoids. These can be very painful.
Make sure that you eat fibre-rich foods and do not get constipated. Light exercises like walking every day can help keep this discomfort away.
Adding a little exercise to your routine will also help manage other pregnancy discomforts like acidity and cramps in the legs.