Really hope someone can provide insight 33wks strong menstral like cramping

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I’ve been to the ER twice for this and all they’ve done is rule out preterm labor and UTI.

I’m really worried that something might be wrong. I’ve been very nauseous and having strong period-like cramping and backaches. So bad that it’s too the point I cannot sleep.

Has anyone experienced this and not had something be wrong? Every time I go in I’m monitored and told baby is doing well but I just can shake the feeling something is wrong.