Period won't start!

Rachael • Married to my wonderful wife, mom to D, twins on the way. lots of other roles and titles.
We're trying to start our IVF cycle. I was put on the pill for a month to get everything in sync because after a year of Meds and IUI things were weird. My last active pill was last Tuesday night. My period still hasn't started and I have a very low grade fever (99, but I'm normally 97). It's like my body wants to have my period but can't.
Has this happened to any of you?