Wrong gender??

Anyone been told gender at 13 weeks, then later told it was something else?? I was told by ultrasound place at 13 weeks I was having a boy.. 300% to be exact. But I had an appt last Monday at 16 weeks with my actual doctor and she said she couldn't tell at all! She even had a good shot. She even pointed something out that she said was probably what they thought was boy. Now I don't know what to think 😁 Just wondering who has had experience with this!