Can someone help me

Shelby

I normally have a 27 to 29 day cycle length, last month I had a 44 day length. I’m assuming because I was just over tired from my job and stressed with life. I’ve been okay for the most part this month and we started TTC for baby #3 this month. Do I track my period as if it’s normally 27 to 29 days or the 44 days?