I had that happen to me a couple times when I was indoor growing years ago. One time I had a full blown herm and another time I think I had two pollen sacs develop on a plant. The second time I just nipped em off with my fingernails. They never grew back, I never found more, and never had any seeds that grow. I thought I read a long time ago that all cannabis females have the potential ability to pollinate themselves as the ability for a female to grow pollen sacs is already there via its primordial (my word) genes. A lot of the original landrace varieties had this ability. It's just through breeding that this ability is either enhanced or hidden. Don't get too depressed just yet bro. I think ya might still be ok...but no guarantees. Someone with a full bar of rep can either confirm or deny this lol