Can a hiv combo test be wrong after 3weeks,p24 + antibody negative i went to my doctor and he said i had reactive lymphocytes. i have given symptoms?

Reassuring, but...: At 3 weeks, the "combo" or "duo" HIV blood test is positive 80-90% of the time, so your result is reassuring. However, you need follow-up testing to be certain, e.g. another combo test at 4+ weeks. If your exposure was particularly high risk (e.g. unprotected anal, known positive partner) and/or your symptoms typical for new HIV, ask your doctor about other tests, such as DNA/RNA testing.