When conditions change, plans change. It doesn't mean all efforts are sank, it means there are better plans to make them more meaningful. So plans develop. The main point is to make this decision where and where. Should we insist on or should we resign? We look at the past, now and the future and evaluate our actions again and again.
There's no big plan, there is one intention with several purposes and goals and numerous mini plans. So if you think/feel it's necessary, do it. Every moment has it's different valid and true actions that you supposed. You can't take action that you don't aware. You can't be regretful for them because you could do nothing. Trust yourself, believe yourself and go on.