Ok so I went to my first ultrasound at 5 weeks because my doctor felt my uterus and said it felt around 7 weeks.  Went to the first ultrasound and the tech told me I was only 5 weeks and could only see the sac to come back at 6 weeks. I then came back and it was there with a heartbeat but it looks bigger than my first pregnancy at 6 weeks & many other people said the same ?!