You are suffering from hormonal changes causing Androgenetic alopecia causing hair fall. It's completely stoppable even regrowth of hair is possible with certain medications without any side effects. Treatment depends on the grade of hair loss. So, it's a must for diagnosing which grade, you are in for an effective treatment. Please  send photos of your head, by direct online consultation for accurate diagnosis and proper treatment.

ANA positivity has very low positive predictive  value. That means ANA can be positive in so many cases. But if it's negative, that's more important for us. It would be a good idea to visit Dr Geetika Srivastava for a complete evaluation