Hcg levels

Sharni • 3 angels babies LGH2015 , LEH2019, LFH2020 1 rainbow EPH2016 Carriers of short rib polydactyl syndrome type 3. Will be starting our IVF with PGT journey next year
So a little about me I lost my first son in January at 19w2days and have been trying again since then. 
I am currently 4 days late for AF so currently day 37 on a 33 day cycle (average) and had several faint positives. I had blood work done and my hcg levels are only 5 :-/ 
Any one else experienced this and has had a healthy 9 months.