This is a regular verb. It follows the conjugation pattern of the verb hablar.
Present:
Me preocupo demasiado por el futuro.
I worry too much about the future.
Negative Imperative:
No te preocupes; todo va a estar bien.
Don't worry; everything will be fine.
Present Subjunctive:
Espero que no se preocupen por el ruido.
I hope they don't worry about the noise.