1. Prodrome doesn’t last a long time like that. Normally, it appears for a few days before an outbreak.
2. The test would be accurate with about 75% certainty.
3. It is normal for the index value (the number you get with testing) to vary some from test to test. Each test is compared to a control sample and that varies from test to test. A decrease or increase of just a few points doesn’t mean anything.
I think you are noticing normal body sensations more, due to your encounter. I could be wrong, of course, but none of these things sound like herpes to me.
If you’ve never had a previous test and you turn out positive at 12 weeks, then you cannot know if you’ve been infected for a long time or it is a new infection.
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Terri