Yes, it sounds like you pushed yourself too far, understandable, biking is wonderful Chest pains and shortness of breath, IMO, should be checked out. What about calling your docotr's office and speaking with the nurse, inform him/her you have started a new fitness routine and then explain what you felt/are feeling. If it is truly concerning you, go be seen tonight. It is better to err on the side of caution.
Jennifer
“Live as if you were to die tomorrow. Learn as if you were to live forever.”
-Mahatma Gandhi
"We are what we repeatedly do. Excellence, therefore, is not an act but a habit."
-Aristotle