UPDATE: I went ahead and took SI cd 3-7 and it seems to be working so far! I just got my first positive OPK for this cycle, today on CD 14! :D To put things in perspective the last two cycles it's been CD 24 and CD 26. If all goes well I should get my temp rise the day after tomorrow and will hopefully have a longer LP. :)
Time for our one attempt tonight, wish us luck! :D