nursing shoes ? toght collar?

da
Okay so my fiance recently bought me nursing shoes so i dont feel tired at work when running for patients or just going up or down the stairs, theyre my exact size and theyre wide aswell. My RIGHT foot fits perfectly but my LEFT foot feels tight around the collar .. how can i stretch them or any at home DIY ?? Pleaseeee 
Im 26 weeks pregnant. My left foot is swollen alot .  
Thank you in advanced.

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