HCG pathology results

Hi all,

Just wondering if any of you have had pathology for HCG levels early in your pregnancy before being fat enough along to get an ultrasound? My levels aren’t rising as fast as expected and needless to say I feel a bit.... anxious. That this pregnancy isn’t viable, that there’s something wrong. That it’s a blighted ovum not a baby..

my levels were

06/02/18 9854

13/02/18 28000

18/02/18. 44000

Apparently HCg levels should double every 48-72 hours but mine have been very slow, especially between the last two.. I could cry because I want this so badly and I want it to be real..