Ok ladies I'm really confused now.... Got my positive OPK yesterday morning and it was negative again by last night. I woke this morning with stabbing pains in my left ovary area of my stomach. I thought I was maybe actually feeling ovulation (haven't noticed this before, normally just get back pain at either side). I've just been to the toilet and there was a streak of very bright blood when I wiped! Now worried that I haven't actually ovulated and all my BD this week has been for nothing! Has anyone else experienced this?