having mild consistent cramps on left side at 28 weeks, is this normal?

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I have been having fairly consistent mild/light cramp ache feeling in my lower abdomen more to the left side and kind of right under my belly almost near my vagina. I feel the baby move a little bit so I think he's ok, but could this be a sign of early labor. I'm 28 weeks should I worry? 
Edit: also feel the baby fluttering really low very close to my vagina area