Recently got off the pill and 35 days later no period

Hey there ladies...new to Glow and TTC. I’m 36 and I’ve been on the pill for nearly half my life. I just got off the pill in Nov for the first time so that we can start TTC. It’s been 35 days since my last cycle and nothing. I’ve taken two tests but they’ve both been negative. When do I need to start worrying that I haven’t gotten my cycle yet and according to the tests we aren’t pregnant?