Yes it adds up. But If I remember, some options doesn't let you stack up membership more than once or twice e.g. credit card, Pins and etc. For pins, once you have less than 14 days, then you can add more membership.
You gotta wait until you have 14 remaining days left, then you can add one membership pin and the total would be 45 days remaining.
Its 12 days, not 14
Rs Emperor

