Hi
@CTTC, indeed if you start trying from cd10 till end of ovulation, it is about 10 days leh...The ovulation week can last 7 days. Doing it 5 times within 10 days is very xiong ar.
I'm not too sure how effective is OPK or how regular is your monthly cycle.
http://blog.kindara.com/blog/top-3-biggest-mistakes-to-avoid-when-trying-to-conceive
http://www.parents.com/getting-pregnant/ovulation/fertile-days/ovulation-predictor-kits/
Just want to ask...Do your body show any symptom(s) when you are near ovulation?
For example, in my case (maybe TMI, sorry in advance), I will start having colourless mucus-like discharge at the beginning of the ovulation week.
I will also have mild cramps which I believe is ovulation cramps.
Some time mid-week, the colourless mucus-like discharge will become less watery and turn into cheese-like discharge.
During this mid-week period, the ovulation cramp will suddenly intensify on 1 side of my lower pelvic area (I believe it's on the side of the fallopian tube that's releasing the egg).
That will let me know that I'm ovulating or ovulating soon.
I actually followed my body's cue when my hubby wanted us to TTC. So when I noticed the intensified pain, I told him I think I'm going to ovulate and we did about 2 times over 4 days (not alternate days)...And bingo
Actually I only started noticing my body's pattern recently after I had cysts problem (mild cramps and pulling feel but the cysts resolved by themselves over time) which made me more sensitive to my cramps and body symptoms.
Perhaps you may want to rely more on your body's signals to pin-point your actual ovulation timing....if you have cramps or discharge like my case.