what does a miscarriage feel like?

I was a few days late getting my period this month- was sure I was pregnant. We have been TTC for 9 months. 
When I got my period it was very heavy and painful, with severe cramps and lower back ache and nausea. 
I'm also so tired, I can't keep my eyes open. And my limbs feel so incredibly heavy, it's exhausting to stand up and walk.
This is not at all like my normal period. Could this have been an early miscarriage?

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