Measuring small

Emily • 22, Married to my love🌹Army Wife 💍 Angel mom of 7

Yesterday I had my first Ultrasound and I was supposed to be 7w5d according to LMP. The tech measured me 5w5d. My LMP was Aug. 11 And it was induced by taking progesterone. I had a negative blood test on Sept. 7th, then a positive home test on Sept. 15th. I was going by my CM for ovulation, which there were 2 times I thought I ovulated. Can I have some advice? I'm a first time mom. The doctor is checking my hormone level and seeing me in a week.