First round of IUI failed

So test day was supposed to be tomorrow but I have come on my period :( it feels so crap when I have that bit of hope thinking that its happening your finally pregnant then bam it gets taken away from you and you feel so rubbish wondering was there anything I could have done different, why is it when you want something so bad it just seems like it's never going to happen, try and keep positive and not stress out but how can I when it feels like no matter what I do or dont do I'm never going to be a mum the one thing I want more than anything in the world fed up of feeling so empty inside