you may.. but the cert can only bring you a job as teacher asst. early childhood is a long journey, a lot of hardwork and time needed.. if you intend to go further, you need to spend more time on prep work and projects. then training and gaining experience in school. being a teacher will also need your commitment during lesson time and off lesson time to do lesson planning and staff training. not forgetting parents meeting, parents engagement activities, festival performances, year end concerts, centre open house, etc. not trying to scare you, just want to prep you on this journey as a preschool teacher.. it isn't easy but it's fulfilling.
Actually why not? If your feel that you are cope and up for it.