Feeling worried 😣

Anyone else been told they are measuring bigger than what they are and then had a scan and baby is measuring fine? I went to my midwife other day and she said I'm 4 weeks ahead but don't look big or feel big and when had my 20 week scan they said baby was right on target for measurements I have a private scan next week that I'm paying for so will be told then as they will do her measurements just feeling worried can someone put my mid at ease please πŸ˜”