Hi mama! Kaya naman, marami akong kaibigan na nag-correct ng maternity notification nila, you can file another one with the correct EDD, pero better call the SSS hotline or visit your nearest branch in person to make sure lang na ma-process nang tama at hindi mag-conflict sa first submission mo. Di rin masyadong hassle, especially pag may error sa government forms talaga, so don't worry!