Has anyone ever had to get their Makena/p17 shot a day late before?

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I'm kinda freakin out about this. I get my shots every Monday. And I'm 20 weeks 3 days today. In three weeks is Labor Day and my clinic will be closed so I will have to get it a day late on Tuesday instead of that Monday. Will this cause any problems? Or trigger labor or anything? I'm so scared. Has anyone had to get there shot a day late before?