On Monday we found out we are expecting twins! Lmp would be 7w3d. Twin a measured 6w3d hr 112 and Twin b 7w3d hr 113. I expected higher heart rates and feel worried about the week difference and hr. My ob called the following day and said i measured a week behind my dates and go back in 2 week to check heartbeats. She said hr were normal since its so early but im a worrier. Is it normal to have a 2wk followup us? Do these seem like normal heartbeats?