Weird period

Rachael • Married to my wonderful wife, mom to D, twins on the way. lots of other roles and titles.
My wife and I are trying to conceive using IuI and clomid. I have done all the tats and do t have any issues. We finished cycle two bfn. Now my period, which is normally heavy (and has never been light for a single cycle) is crazy light to the point where I don't even need to use anything.
After cycle 1 with the progesterone it was super heavy. Why would this month be different?