it us a bit early to tell sometimes, but for me it wasnt. I had what is called a blighted ovum. The gestational sack grows, but the baby does not. I've had two. They are rare, so keep your chin up. I'm sure your baby is just too little yet.
Our daughter who is almost 3 was nothing but a sac when we first got a peak at her. We waited anxiously for our next ultrasound. A few weeks later and there she was right on track with a little flickering heartbeat! The first ultrasound it was just to early! Hoping for the best for you!
Did they check your hcg levels
That happened to me. I was actually 5 weeks but was 6 according to my LMP...seems I ovulated about a week late, so my baby was younger than they thought. By 6 weeks they could see her. It's scary, but try not to worry too much yet. By your next ultrasound you'll know for sure.