Geez, your nurse is a scare-monger!! 8's ok....I'd love an 8!!! (but your 12's not so good). FSH is a flucuating thing, and despite my overall poor responses and disappointment, my FSH never went over 12.9. Anti-mulerian hormone (hope that's spelt correctly) is a much better guide to your like response. Mine was 1.8 which was crap (but meant I could seriously think more about alternatives to my ovaries!). Have you had your AMH checked?
But despite anything and everything, it only takes one! but I hope you get loads! GOOD LUCK!!