With DD1 my cycles were 30days. We weren't ttc and we dtd 4 days before O. I Oed on cd 16. Then with DD2 my cycles were 33 days long, we dtd 5 days before O and I Oed on cd 20. This time my cyles were around 34 days long, we dtd on O day which was cd21. Not sure what we are having yet..but I am sure it is a baby.