Future BFP?

Ok ladies, I had two days of light red bleeding, very light cramps, then a day of nothing, the four days of brown discharge with no cramps. I've been discharge free for three days and now I'm getting mild cramps again with twinges about and inch below my belly button. What the heck? I had a bfn at 19dpo but now I'm wondering if I got my O date wrong??? What do you think?