20 Weeks and Exhausted

Is anyone 20 weeks and still feeling exhausted? I literally sometimes feel like I have been hit by a train. There’s days I just want to sleep all day and don’t feel like doing anything. I once in awhile feel clammy or like get hot flashes. Is it just hormones? Should I have energy now at 20 weeks? I have a two and one year old at home with me so I’m trying hard to stay afloat! I’m taking my prenatal and iron so hopefully those will pass me some energy soon. Any advice or anyone one else still feeling sluggish at 20 weeks? I mean I guess we are all growing babies which is hard work!