Sofosvel was the first generic on the market, and comes from Beacon in Bangladesh. They produce Darvoni and other DAAs.
Panovir was the second generic on the market, and comes from Incepta in Bangladesh. They produce Twinvir and other DAAs.
Velpanat was the first licensed Indian generic to hit the market, not in India, but in Nepal. It is made by Natco who tend to be the first to release medications, and do it via Nepal.
Now all the Indian manufacturers are supplying SOF+VEL combination tablets.
Undetected at 4 weeks is usually a good sign. Not 100% certain, but you reduced the chances of failure by 50% when you came up undetected.