Hello mam, thanks for trusting health care magic.
This bleeding on day 18 is not normal and should be taken seriously but as you said it isnt possible to get HCG
testing so just have complete bed rest
and keep taking all your medicines on time till its possible to get testing done.
This bleeding can be an early sign of abortion
or just an implantation
bleeding but rising titres of HCG is the only measure to determine the etiology of this bleeding.
In case you have further questions you can consult me on health care magic forum and i will be happy to help
Take care and wish you all the best.
Dr Manisha Jain (infertility