Period delayed after failed IVF

Sa

Hi there, had a failed <a href="https://glowing.com/glow-fertility-program">IVF</a> cycle in June which resulted in no embryos or transfer. So am now waiting to get my period to try a new protocol but I’m currently a week late (not pregnant). I had my first period after stims and now waiting on the second one to try again. I’ve never been this late. Did anyone else have a period delay this long after a failed Stim cycle? For how long?