Gender at 15 weeks

I’m pregnant with my 4th baby and I have 3 boys now. I went to my regular ob appointment and they were so nice to check the gender for me. The baby was moving around a lot and she spent a good 10 mins looking very well. She says “well I think you might get your girl” and said she doesn’t see any boy parts and that usually she’d see something by now… the baby was moving a lot and she didn’t want to give me 100% confirmation but now I’m so confused!!!! I need to know!!! With my boys they were always able to see them as boys this early on, I don’t know what to think

Update: ITS A GIRL! I had a gender ultrasound and she checked 5 times!