Cramps 4 weeks pregnant

Anybody elese? I've had a previous miscarrie so I'm keeping a positive happy mood but I have noticed like achey cramps way low. And it make me a tad worried is this normal? I'm only 4 weeks and can symptoms can show up this early but I've had severe symptoms my emotions are over the top outta wack one minute I was uncontrollably laughingabout somthing silly and a little while later I was bawling My eyes out about somthing my sister said. I'm have cravings and it's intense like I have to have spicy food( I usually am not a fan) i get nauseated if I don't eat every few hours. I have to pee a lot and I'm exaushted. I know it's not all in my head and that these are ligit symptoms I'm just nervous for my baby. Anyone else have symptoms this early any feedback would be appreciated :) thanks