Alcran Not an expert, but yes if it has started to crack then you have no choice but to collect and then to stratify... why only 13 seeds? I imagine you should have more. I had some ripe seeds of Sarracenia last year, but I didn't bother to stratify, so no germination for that batch at all.
As you live in NY, that means waiting until the start of thaw to plant them... long wait
TTFN
Arvin