New Due Date

So I had to go see a Perinatal Doctor yesterday and it looks like instead of February 27th being my due date my new due date is March 24th. The Dr. I go to thought the baby looked small since my first appointment. He said that the baby looked to be 2 weeks smaller than what I was going by my last period but since my periods are irregular I must have ovulated late, really late. I was pretty bummed bacause I was thinking I was 18 weeks pregnant and to find out i'm only 15 weeks is crazy. It also explains why i'm so sick still. I was also bummed because I was excited to find out what we are having and now I have to wait.