FMLA and pregnant

My job is about to fire me because of how many sick days I’m taking. I’m 13 weeks pregnant and the morning sickness is serious. I can’t eat, I pass out, in losing weight. So I was told about fmla (The family and medical leave act) I did print out the papers for it. But I was told it’s only for complicated pregnancy. Which mines isn’t. I’m having a normal pregnancy. I have till tomorrow to fax in the paper or else the time I have took off (sick time) would count and get me fired right away. What experience do you moms have w fmla. Does it have to be a complicated pregnancy? I’m nervous cause this job offers amazing benefits and I don’t want to loose it even so more now that I’m pregnant