Yes.  There are very strict time limits for you to file a charge of discrimination which is likely your first step in pursuing a case.  The time limit in Missouri is 180 days from the discrimination, harassment, or retaliation you are complaining about.  In other states, you may have up to 300 days to file such charge.  You will then receive a “right to sue” letter after you file your charge.  You have only 90 days to file a lawsuit from the date of that letter.  You thus should contact an attorney if you believe you may file a case.