I thought my Bitsy was having a false pregnancy too so I did a lot of reading on the internet about it. From what I read, some dogs do have to have medicine for it and it can be very stressful for the dog as she really thinks and feels she is pregnant, but no pups
Also, I believe I read that Some dogs have no problems with this but the ones that do, it is likely to recur. I just typed in "false pregnancy in dogs" and it pulls up a lot of info!