Help!!!

Leticia
Well unfortunately... I think I'm about to be out... 
Has anybody had similar:
6/19-Went in for US for spotting... Sac measured at 5w.4d... No fetal pole seen
HCG at 15,436
Went in today 6/28 for 7w US- sac measured at 6W with a fetal pole only...
Going tomorrow to do blood work and OB wants me to go have an ultrasound done Saturday or Monday to confirm gestational age at a radiology..