Advice

My husband and I have been ttc for baby #2 for almost 2.5 years now. We have started our testing process. But I have been regular on periods since I was like 15. Generally ovulate around cycle day 13/14 (did not track this month, I need a break) well I’m 2 maybe 3 days late on my period (never have been except when I was pregnant with my daughter) but I’m testing negative. Any thoughts on what could be going on here 😂😂😂 (no major health changes or added stress this cycle either)