Welcome to the board. I'm an ultrasound tech so I have some of that hcg info crammed in my head. We cannot see a pregnancy until the hcg level is 1000 - and that's by transvaginal ultrasound. By abdominal ultrasound the number has to be approx 1800. So the numbers your daughter has is too low to see by ultrasound yet.

Another important key is the fact that her hcg level is doubling every two days. This is showing a couple of things. 1) she is still pregnant and hasn't miscarried yet since the numbers are increasing, not decreasing. 2) ectopic pregnancies have hcg levels that increase but they do so more slowly. They don't double every 2 days like a normal pregnancy. So this is hopeful that her pregnancy is indeed in the uterus.

Now please be cautious. Just because the numbers are increasing appropriately doesn't mean the pregnancy will continue to be successful. It sounds like she's having a bit of bleeding and cramping. Spotting and mild cramping is normal but the heavier stuff can be a foreboding sign. Be hopeful yet guarded at the same time. I hope everything works out for you guys