Hi, bleeding gums is a very common problem and even though there is no pain, it does not mean you should stop treating it!
Let me explain what is 'bleeding gums'. It is a sign of inflammation (A response from our body to protect us from infection or harmful stimulus) in your mouth. It is usually due to gum diseases which initiate from the bacteria in the plaque. Our body's defence tries to 'fight' with the bacteria and in the early stage, you will see just redness and probably mild swelling of your gums. If the plaque is not removed (by brushing/ scaling), the bacteria accumulates and infection becomes persistent, now the pain may gradually get worse. If it is still not resolved, the pain might be severe and simultaneously, you will have serious infection of your gums.
So, please do not ignore any sign that your body is telling. Visit a dentist as early as possible once you encounter any problems regarding oral health.