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I understand your concern.
Your karyotyping were normal and it gives the meaning of no chromosomal abnormalities (attachment removed to protect patient identity). Coming to IgG positive test, when you contract a viral infection or after vaccination, the antibody produced is IgG. It indicates that you are either vaccinated or had an infection before. This will be positive for your life time. If IgM would have been positive, then it indicates that you are having a recent infection. I think you need not worry about those positive tests. Is there any history of such infections before? I sincerely suggest you to take an opinion from your treating doctor. Since she can examine you directly with previous histories, you will be more convinced.