i have had the same issue, they arrive way too soon
i've transcended at least 3 times and the pink ones (the ones after purple) arrive before i get anywhere near the 5M cells needed to start producing enzymes, the pink ones usually are between the 1st and 5th overall spawn of the Xenocytes, e.g. 1st xenocyte spawn = green, 2nd spawn = green, 3rd spawn = pink)