Ovulation testing and not getting positive

Jessica

I got off my period cycle day 7 we are now cycle day 18 and my ovulation test are not showing I've ovulated I've had eggy type CM and my test get really close to being positive but they never full get to positive. This is my first month off BC ( the pill). We've been BDing every other day just in case we miss it. But due to my work schedule I can only test in the morning right when I wake up and usually right before bed. Is it normal to be this far into my cycle before showing a positive opk or is it positive I just ovulated and didn't know it?