J.P.
I know of plenty of people that have had spotting for a few days, or even throughout their pregnancy, so if the doctor isn't worried, I would relax and follow her advice. As for the size, I would also relax with this. I was told not to expect my pregnancy to be viable because the blood test didn't match what the dates said, but my 10 week old proves otherwise. When you go in next month, as long as she is consistently growing over the month, don't get caught up with the exact date.