Measuring behind

K • After 3.5 years, 6 IUIs, 2 rounds of IVF, & a ruptured ectopic among other things we are FINALLY pregnant. ❤️💜💛💚💙
I went to my appointment today and I'm measuring 2 weeks behind! I was not at my last appointment. My doctor moved up my ultrasound to my next appointment which is in another 2 weeks to make sure everything is okay... Is this pretty normal or should I be concerned?