Hello @arecio thanks for replying.
I've already got the solution! \o/
For those who are also having this problem here's the solution:
1) Make sure you are using the same:
Inside both files:
1) /opt/bitnami/apache2/conf/bitnami/bintnami.conf AND
2) /opt/bitnami/apps/wordpress/conf/httpd-vhosts.conf (in my case)
I was able to succeed using same SSLCertificateFile and SSLCertificateKeyFile inside
1) <VirtualHost default:443> -> bintnami.conf
I hope it helps somebody.