Not unless they wanted to interrogate you AND use those statements against you in court. For the majority of arrests, Miranda isn't required, because police generally are able to establish probable cause for arrest without incriminating statements from the defendant (such as the sworn statements of security personnel, physical evidence in the form of the stolen item, etc.).
It's possible. Courts don't like seeing people back for a second offense. It tells the court that the consequences for the first offense weren't enough to make the proper impression. Whether or not your particular case would warrant incarceration, only a criminal defense attorney who is familiar with the specific judges in your jurisdiction (and their sentencing habits) could hazzard a credible guesssecondly, am i facing any jail time.

