Measuring Behind

So today I’m 8 weeks and had my 8 week appt and ultrasound. Ultrasound showed I was only measuring 6 weeks 5 days. My dates are accurate and I was taking the ovulation tests so I know I should be 8 weeks and dr seemed worried that I’d be measuring small. Also, couldn’t find a heartbeat. He said he did see the heartbeat here and there but I think he was trying to make me feel better. He also saw 2 cysts on my left ovary but didn’t seem too concerned with those. Another ultrasound is scheduled in a week or so, so just waiting for now. Anyone else have this before and everything was ok?