Clinging to hope here.

I got a positive ovulation test 2 weeks ago today. I classed that as ovulation day and a wud be due today. I had brown discharge this morning so put a pad on. Nothing has changed. Still just Lil brown discharge on pad. Nothing there when I wipe. Now could I of ovulated on th non or Tues and only be 12 dpo n be experiencing implantation bleeding or am I just clinging on to hope now n it's my af starting. ......which usually starts quite heavy and red with cramps. I'm having none of this. Shud I test in a few days? Help plz