Help! Need opinions

I’ve been ttc for over 2 years. My period is normally every 28 days like clockwork. Never have I missed a period. Since we’ve been trying for so long and no success, we’ve seen doctors and everything (unexplained infertility). Last month we decided to make an appointment to start the IVF process so I decided to take a break on my ovulation tests and see what would happen as we have an appointment early in February to meet with an IVF doctor about starting the process. Now I’m kicking myself about not tracking ovulation seeing I was supposed to get my period on the 29th (Monday) and nothing, I took a cheap dollar store pregnancy test later that same day and BFN, I figured I was testing way to early. So I waited until yesterday morning the 31st, cycle day 31 (2 days late) and another BFN. Am I testing to early should I wait until it officially has a week after my missed period. Could my levels be so low they won’t show up on a test yet? Could I have ovulated later? I’ve never been late before so I wish I would either get my BFP or AF so atleast I would know whats going on. I’m driving myself crazy 😞