Having a difficult time

So, for the past week I have been trying to pinpoint my ovulation. I usually have a 31 day cycle according to when I start AF. This month I started taking some ovulation tests to help my husband and I bd at the right moment. Long story short my opk’s have been negative for the last 10 days. I’ve still been doing the deed in case I surged and missed it. I only take one test a day, (I work long hours, and don’t want to take one at my job) which could be the reason I can’t pinpoint this surge down. I just needed to get it off my chest!

my husband is compassionate but has a difficult time understanding my frustration right now.