Is it possible for the Dr. to be wrong. I went for a sonogram and they told me the gestational sac shows i should be about 7 weeks 5 days, but they saw no yolk sac. The dr says i am most likely going to have a mis carriage. But there are rare times it just cant be seen till about 10 weeks.They checked my HCG levels and say they are still high. I ha ve no spotting at all. I go back in a couple of days for another sonogram. I'm so upset, is it possible he is wrong?