I'm supposed to be 8 weeks, 2 days but my sonogram measured me at 6 weeks, 0 days. Should i be concerned? The doctor didn't seem concerned in the slightest, she pointed out the heart beat, yolk sac and gestational sac and said things "looked healthy" but also said she didn't feel comfortable using the heart doppler because it "emits a little heat". Should I be concerned? The baby measured at .035cm. I saw the heart beat.