Hello mamas?

Hello mamas ?!!! How are you? How is the pregnancy going? How are you feeling? ? Until today, by calculation from my last period I was told I’m 35 weeks 6 days (05.05.2020), but today I had an ultrasound and they said that by the size of the baby and belly I’m 34 weeks 5 days ?! Which do you think might be more accurate? Have you had cases like this? And for what indication did you give birth?