Hadn't planned on SAT but does PSAT score mean I should now??

REVISED POST/ QUESTION: (can you edit posts on CollegeConfidential??!!)

I received a SI of 222 (in CA) on PSAT. I was not going to take SAT only ACT…but peers are telling me I need to take SAT since I may qualify for NMSF, which I did not know much about. With 222 in CA should I be registering for SAT before school year ends???