Should I test?

So nervous to write this, my period is 4 days late - it was due on the 15th October and normally lasts 4 days my last period was on the 16th of September. 
​I've had cramping and my temperature keeps rising and dipping. The cramping has completely gone today as I feel ok. My appetite has mainly gone. I would say my boobs feel a little firm but not much. 
​Just wondering if I should test now or leave it for a while 
​Thanks for reading x 

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