Also, see the following RG links and a PDF attachment.

Article BCG vaccine: a hope to control COVID-19 pandemic amid crisis

Article Correlation between immunity from BCG and the morbidity and ...

Article Could BCG Vaccination Induce Protective Trained Immunity for...

Preprint Correlation between universal BCG vaccination policy and red...

Please read the following articles.

Pending further research. Theoretical basis for COVID amelioration, but yet to be proven.

The image in this link is among those that started the speculation of a relationship between COVID-19 and the BCG vaccine:

http://www.ipsnews.net/2020/04/bcg-vaccine-fighting-coronavirus-south-asia/

Aside from a possible boost to your innate immune response it seems unlikely there is a cause and effect relationship, more studies are needed at this point.

BCG vaccines are supposed to induce metabolic and epigenetic changes that enhance the innate immune response to subsequent infections, a process termed trained the immunity which might, therefore, reduce viraemia after SARS-COV-2 exposure.

Interestingly, countries with the national programme of whole population BCG

vaccination appear to show lower incidence and death rate from COVID-19 as

compared to those where BCG vaccination is not mandatory.@Ziad Delme

Initially thought. It's too early to say.

Agree with Respected Nirmal Mohakud

BCG vaccine may have a protective role for COVID-19, but there is no such proof for chickenpox vaccine.

Preprint BCG vaccination may be protective against Covid-19

Please have a look at the following RG links.

Article BCG vaccine protection from severe coronavirus disease 2019 (COVID-19)

Article BCG as a game-changer to prevent the infection and severity ...