First tri/first pregnancy

Is it normal to gain like that within that period of time? I am currently 5weeks and 5days, been eating a lot,feelings nauseous mainly at night/afternoon(no vomit), weird feelings in my stomach- cramping/tight/pulling/growling, I been having like no energy through out my days, been waking up middle of night or early morning just to use the bathroom(urinate),hard to get comfortable.