Still waiting for my periods.. around 5 days left.. In case if its positive.. how can I abort at this stage? It will be harmful? It can create problem in conceiving future? Please let me know in little detail?

You will need to wait till you are 14 days late to test. If you are pregnant, you will go to a doctor or clinic to terminate the child. It is fairly safe, but with any medical treatment, it is possible.