Actually you read wrong

.
Calibrating simply helps the internal guage of the amount of 'juice' left in the battery be more accurate and official Apple documentation says that they recommend doing this once a month...so 3 days would have been premature.
Honestly, you don't NEED to do this at all. Since you are new I will forgive you LOL, but you will learn that there is nothing that you NEED to do to your laptop or any Apple product unless you are having issues. Preventive maintanence is not something Macs need as opposed to Windows machines which need coddling.
There are people who obsess over every little fluctuation in battery life percentage and every stray degree of heat their CPU starts to produce, but just relax and let the system perform as designed and only worry if something doesn't seem right.
Only thing you really NEED to do is perform regular backups of your data.
Enjoy!