It is likely that you are limited to 2 years from the date of harm/injury. However, if you did not find out about the injury/harm until later, then you may have more time. When the statute of limitations begins to run can often he a difficult question to answer. Thus, I recommend gathering all your medical records related to this and then finding an attorney to review them for you. Most consultations are free. Best of luck.
NOTE: This response is general in nature and should not be considered legal advice. No attorney-client relationship exists and none is formed by this response.