Advice please

Kandi • I have 3 beautiful daughters I have had 2mc 12-22-12 and 4/9/14 my husband and I have been together 13 yrs
Went and done a beta and progesterone blood test today my hcg is only a 7 but progesterone level was 6.5 I am 4 days late got all my positive conformations from health department and dr but hcg is low has this happened to anyone else my last period was 8/7 and I'm on 22 day cycle plz any advice is gratefully appreciated