90 percent gender confirmation

I’m 15 weeks and 4 days today and went for my routine scan, my Gynae tried to find the gender but baby’s leg was tightly close, after trying moving a bit, with a little luck, my Gynae told me he has a gut feeling is a boy, so he kept it as 90percent boy, 100percent confirmation during next appointment. Has anyone else experienced this? And was there a change in the gender between the first and second time?