Baby measurements

Mar • What a surprise!
So I had an appointment yesterday with a scan to see if my hemorrhage went away-it did, very exciting. However when they measured the head and femur and out everything together they estimate that this monster is weighing in at 6lbs already..... I'm 31+5. How accurate are these from other momma stand points? I know around this time they're more accurate than later on but I'm freaking out. At this rate I'll be birthing a bald linebacker 😰