Skipped Period? Now what?

Katie • 27, Married for 2 years, TTC Baby #1 since Sept. 2018

I’m currently in CD43... period is late by 9 days. BFNs everywhere. Did my period just decide to not come this month? Granted, I got off the pill in September (and had a chemical pregnancy right away). Does my cycle just start over now? If this has happened to anyone, please advise. I am such a newbie to all this. TIA!