SERIOUS QUESTION! please help!

I am like clockwork when it comes to my period and ovulation, it's crazy how on point it has been my whole life. Been TTC for over 2 years with 1 whole year of treatments including 2 rounds of IVF, failed obviously. My question is, has anyone ever NOT ovulated one month for no reason at all? I track from the day my period ends to the day my period starts and I ovulate every month except this on and now no period and no signs of her showing at all. So then how will I know when I ovulate again? Will I just start my period on schedule next month? I'm so confused!