Shocked

Nadia
Went to ER for some vaginal bleeding after sex & was told they only see my gestational sac and that I have to be 4-6 weeks pregnant. My first day of my last period was March 8th & I found out I was pregnant on 4/17 and was told I was about 5 weeks and 5 days pregnant. I'm confused and don't understand at all . 😩😩 Can someone tell me something about this please ??