This is a regular verb. It follows the conjugation pattern of the verb hablar.
PresentPresente
Me preocupo demasiado por el futuro.
I worry too much about the future.
Negative ImperativeImperativo negativo
No te preocupes; todo va a estar bien.
Don't worry; everything will be fine.
Present SubjunctivePresente de subjuntivo
Espero que no se preocupen por el ruido.
I hope they don't worry about the noise.
Imperfect SubjunctiveImperfecto de subjuntivo
Llamé a casa para que mamá no se preocupara.
I called home so mom wouldn't worry.