I was told my oxygen level is 88 do i need to worry?

88 is low. I was always weary if my patients dropped below 90. Do you have COPD or phnemonia? Try taking a couple deep breaths to bring up your pulse ox level. If you have congestion, I would suggest taking a slow deep breath, hold for 3 seconds, and couph. It will help get the air behind the mucous. Are you walking? That will drop your oxygen level. Don't worry yet, just work on bringing it up.