Home Ovulation tests

Ok here's the deal. I typically have 26 day cycles. We have been ttc since june with no luck so far. Have been tracking my CM and really haven't been falling into the trend of what it's "suppose" to look and feel like while ovulating so I bought a home ovulation test. Per kit instructions for a 26 day cycle I tested on day 9 and day 10. Both negative. Could I have already ovulated or perhaps I haven't yet? My ob said to have sex on day 6,8,10,12 this month and we should hit the right day. What do you all think?