new job

okay you guys I recently just started a job but I was not too fond of like I've only worked 2 days.. I took this job because I needed a job and first come first serve right well I've been applying to jobs that I have went to school for I am a dental assistant and currently could not find work so I went back to being a CNA.... I recently have gotten a job as a dental assistant I should say a job trial now I have an interview tomorrow for another job for a dental assistant my problem here is I'm not sure what to do about my current job the dental assistant job that I got today wants to give me a trial run this next week Monday through Thursday I work those days so I'm not exactly sure what to do my husband says to quit my CNA job and don't worry about it but what I'm worried about is if this dentist doesn't really particularly like me or I'm not picking up things as fast as what he would like me to do and he thinks that it's best if we don't continue employment I'm not sure what to do you guys please help