Are you really early? I remember really bad back pain/cramping around 5 or 6 weeks with my first. I panicked, googled, and apparently it's super common. (Probably the first time in the history of my life that googling a medical symptom did not panic me further, LOL.)
“Life is not orderly. No matter how we try to make it so, right in the middle of it lose a leg, fall in love, drop a jar of applesauce.” - Natalie Goldberg
I give you virtual back pats though, because I know I was nuts about everything pregnancy related with O pretty much up until delivery. Nearly everything about his pregnancy was different than L's. He's perfect and healthy and I will cross my fingers for you that your baby is too.