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The most likely cause of the hardness and pressure is the fact that you have problems with constipation. Calcium can cause constipation. It will help if you increase both your fiber and fluid intake. Fiber supplements like Benefiber or Metamucil can also help. Eating lots of salads and green vegetables, along with whole grains will help to avoid constipation.
Please reply if you have additional questions about this.
Without an examination it isn't possible to say for sure what the problem is. However, constipation is a very common cause of hardness and pressure. An umbilical hernia is another possibility, but you would need an examination to diagnose that as well.
No, I don't think it's anything serious. You should see your doctor anytime in the next month.