It is absolutely possible! It is also very very important that you call your health care provider today and be certain that the swab test that was taken is being typed (HSV 1 vs. HSV 2). HSV 1 recurs very infrequently. Is your husband the giver of oral sex to you? If yes, then even without a cold sore he could have infected you during oral sex. Or, as you note, you could have had this for years and you are just recognizing your first recurrence or he could have had it for years and recently infected you. A newly recognized outbreak does NOT indicate infidelity so I hope you don’t jump to that conclusion. The swab test results should come back in just a few days. You might call and ask if the test being run is culture or PCR. PCR from a lesion is far more sensitive than culture but both can be typed and a culture could certainly also be positive. How long after the sore showed up did you have it swab tested?
Terri