Measuring early/ delivering early?

Ive been measuring 3 weeks early since I was 25 weeks currently 33+4. I was wondering if anyone has measured early and ended up having an early delivery. I'm a FTM btw. And also baby was already weighing a little over 4 pounds at 31 weeks. Dr says I'm looking at an 8 pound baby and my LO has been heads down since 28 weeks!