Confused

Well i am posting this just to vent about it. I feel so blessed to have our beautiful daughter, i can't believe she is already 4...i really do feel complete about our family....so why is it lately i find myself day dreaming about getting pregnant....which i know is not going to happen..i mean if i can't get pregnant after 5 iui's and ivf, and no birth control after 7 years of marriage the likelyhood of it happening is so slim...and honestly even if i did miraculously get pg...i think i would feel conflicted. I am in a really good place now, izzy is so easy and my job is going really well and i have huge plans for the future...we are also planning some big vacations in hte next two years...hawaii in december, Disney in March and Austrailia in march 2013...so why in the world would i want a baby???? but at the same time i find myself thinking about it and paying more attention to my cycle than i have in years....wtf? I think maybe it is because it seems i know a lot of pg people right now so it makes me think about it. Who knows...i know that 80% of me really doesn't want another child..i just wish i could get the other 20% on board. the other thing i have been considering which maybe a factor is i am considering having a IUD put in because my periods have been aweful lately..bad cramps etc...so i think that makes me think that then there will be no miracles and it will be certain that it won't happen...who knows! I hope this phase passes!!!