Crampy? Ftm question

Erin
FTM here so this may be a stupid question but I'm 15w4d and im feeling cramps kind of like period cramps...no bleeding or anything but my lower back is hurting too like when I'm on my period. Is that pretty normal? Are there any signs I should watch for that could be bad? I had an early mc right before this pregnancy so maybe I'm just being paranoid?