3rd trimester

i’ll be 28 weeks in 2 days. Is it normal to feel crampy it’s not horrible cramps but all around just feel achy after a long day. I do have a 2 year old so i don’t get to just lay around and “rest”. I do mention to my dr every visit that i am crampy and he doesn’t say anything about it. I don’t remember feeling like this with my first because i had the choice to just lay around all day and not have to take care of anyone other than myself. Now i feel like i’m constantly on my feet and constantly cleaning my house because i have a 2 year old and i’m a SAHM .