My first beta was 16 at 11dp3dt for IVF #2. My nurse told me right from the get go that it has a very low chance of being viable. You hear all these success stories with low betas, but the vast majority end badly. I'd say that you have <10% chance that the pregnancy is viable, but it is still a chance. Hopefully you get that miracle! You need a beta of 200+ by 21dpo for the pregnancy to have any real shot (about 30% chance of a take home baby if that happens).
For me, my beta continued to rise, but the doubling time got slower and slower until I made the decision to stop PIO. Then it went down pretty quickly.
A "chemical pregnancy" is a term that means a miscarriage before anything was seen on an ultrasound. The only way you know you are/were pregnant was by a blood test which measures hormones (chemicals). It is a real pregnancy.