So, I am on CD16 today, I haven't had a positive opk but I only do them once a day and not sure I'm very good at them as can't seem to hold my wee and not drink ect. Anyway, last night I had some brown blood on my liner. Only a tiny amount like maybe about the size of a penny. Nothing there when I wiped. Do you think maybe that was ovulation bleeding? Or not with me not getting a positive opk?