Hi English Is My Second Language But I Hope That

Hi English is my second language but i hope that you will understand me
So I am 38 weeks pregnant and I don't have more energy to continue my job I am tired. My boss told me that I can already start my FMLA if I don't feel ok She said that I only need a note from the doctor so i can start FMLA but my doctor doesn't want to give me a note because my pregnancy is healthy how I can tell my doctor that is ok my boss already sent me home and let me use sick days.