25+5 weeks feeling very exhausted

At the beginning of my pregnancy I was soooo exhausted I could sleep all day! Once I hit the second trimester I was feeling much better I could actually go without taking a nap but now I'm starting to feel very exhausted again. I wake up at 7am every morning and drive my sister to school come home make breakfast for my little brother and I then take him to school when I get back home I feel so tired I just wanna throw myself back to bed and go back to sleep. My legs even hurt :/ is it normal to feel like this? Does anyone else feel so tired ?