struggling with fatigue

i’m 17 and ten weeks tomorrow. the fatigue has been kicking my ass 😩 everytime i log on to do school (cyber) i get through maybe one assignment (if i’m lucky) before becoming too exhausted to retain any info. i need to nap all the time. i sleep 12 hours a night and usually take a two hour nap throughout the day. i also take care of my seven year old sister and help her do her school work and baths and all that. is there any suggestions on how not to be so tired or am i just gonna have to deal until my second trimester hits? it just sucks because i am falling behind in school and just began with a new cyber school. pls any help