Unsure what's happening? 🙈

Ttc, my last depo shot ran out in September so been trying since then. I usual have really heavy periods and there pretty often always have been since I started. This month I was 11 days late and today Iv started but it's a lot lighter than usual, I have a panty liner and that's all.  I last took a test a test on Saturday and it was a bfn so just wondering if you think it's my actually period or we could of made a peanut? 🙈🙈