Contractions or baby's position?

I'm having a really hard time determining what a contraction is and isn't tonight. Baby is definitely in front - I can feel the bum sticking up and my belly is lopsided! It's rock hard, but I'm also getting lots of low cramping and back pain that is mild to moderate that comes and goes. Is there a good way to tell contractions from baby's position? Usually it's not this difficult for me to tell.

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