I had an HCG blood draw around my 4w2d and my HCG was 581.5. They had me come in 48 hours later and my HCG was 786.4. While it went up, it didn't double. Now they want me to come in in 2 weeks for an ultrasound. I am very nervous now!! They didn't say anything else so I feel lost! I already had a miscarriage in June and now I'm afraid this could be too! Anyone know anything or have advice?