If I believe I am having a miscarriage can I wait till morning to call my doctor or do I need to go to ER? (4 weeks 6 days)

If I believe I am having a miscarriage can I wait till morning to call my doctor or do I need to go to ER? (4 weeks 6 days) 
-I don't know where to post this so please be kind if I posted in the wrong spot. 

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