Scared about my fatigue

This might sound stupid but i’m 6 weeks pregnant and my fatigue is horrible. I’m awake for about 2 hours and need a nap then I wake up and could easily fall back asleep. I mentioned it to my mum and her reply was “you’ll have no time to be tired when the baby is here”

So my question is...

Is fatigue worse whilst pregnant or is it the same type of fatigue after the birth too? I know that having a baby is tiring as you’re up all hours but i’m scared that if it’s the same type of fatigue I feel now that I won’t be able to care for my baby. (ftm worries haha)