Hcg levels

Sharni • Married my best friend on 5 October 2013. Lost our first baby 15/01/2015 at 19w2d.LGH now due with 🌈
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.