Need advice!!

Jenna

I’m 31 my fiancé and I have been trying for a year now. I’m taking ovulation tests and tracking as much as I can. In oct I thought for sure I was pregnant my period was over2 weeks late but I kept getting negative tests. Finally got my period. Same thing is happening now my period is over a week late and getting negative tests. I’m seeing my doctor in a few weeks. Would this be a chemical pregnancy or is my cycle just that messed up?!?