FALSE POSITIVE HIV TEST!

I had my first ultrasound for my second pregnancy last Thursday, the baby looked good the heartbeat was perfect and I got bloodwork done. 2 days later my blood work results came in and my doctor called me the moment the office opened to tell me that my HIV test came back reactive abnormal! He told me he were to send my blood work out for a more accurate reading for HIV1&2. 3 excruciating, sleepless, anxiety filled days later I got my results back and I am negative across the board thank God! My doctor told me the same exact thing happened to another pregnant patient a few weeks prior. Has anyone else ever experienced this? It was truly the scariest time of my whole entire life.