I was told that it can take up to 1yr after IUD for your cycles to get back to normal. I'm not sure what the average is. You might want to jump over to the Birth Control board and find out if someone there knows. Looking at your last cycle though I think you Oed on CD21, but had a 12 day LP (I'd override FF if I were you). Don't give up sweetie!! I think giving yourself the September deadline might not be realistic considering you just got off IUD. I understand the whole deadline thing and I'm sorry you have one. *hugs*

Just hang in there! Let's see what this cycle does and maybe we can help you assess what's going on if you don't get your BFP.