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Hello from JustAnswer.
It would typically not be a good idea to use an injectable drug that expired more than a year ago. A medicine that is this old may have lost potency and also may no longer be sterile.
How long will it be until you can fill the prescription for Lovenox?
Since you can get medicine at 1 this afternoon, it would be appropriate to skip the dose until you can get medicine that is in date at that time. But you should go ahead and take a dose as soon as it is acquired, regardless of the time at which it is usually taken.
If I can provide any additional information, please let me know.