My LMP does not match with the pregnant week after ultrasound scan. Shd be wk 7 but its wk5. Only has gestational sac.

my lmp edd and ultrasound scan edd is about 5 days diff. ovulation period could be longer so using lmp to track edd may not be accurate. gynae usually would use the crl measurement to track the growth and determine the gestation age and edd. did first ultrasound at 5w6d and then second on at 7w5d and the growth within these two weeks is consistently so gynae used the ultrasound scan measurement to determine my edd instead of my lmp. think your gynae will ask you go back for another scan in two weeks to see if there's growth and heartbeat at week 7. take care!