Is this bad? Thoughts would be super appreciated

I had a 6 week scan today no heartbeat was seen I know my dates cos I was tracking I was meant to be 6 weeks exactly but the embryo was only measuring 5.2 I think the tech said it was only measuring just under 2mm and google says you won’t see a heat beat until it’s 7mm so I seem to be fairly out? Should I expect the worst ?