Ovulation predictor kit accuracy

Although I get my period regularly, with cycles which vary from 30-33days, I have never had a positive LH test with the at home ovulation predictor kits.  Is it possible that I get my period regularly, but I don't ovulate regularly?  We've been trying to get pregnant for about 1 year, and we are now having all the fertility tests done to see what the problem is.

[sweetdrda]

I have had the exact same problem except that I did get a + OPK 2 times but was testing for almost a year.  I wonder if we do ovulate but our hormone levels are not high enough to show it on the OPK.
I am interested in the answer to this because I get my AF everymonth (and 1-2 times a year 14 days apart) and do not understand it as well.

[Heather5]

If you have a regular cycles, you probably do ovulate. Sometimes, you can miss the surge if you test at the wrong time. Let's say you test at 9 a.m. every day, yet your surge occurs at 9 p.m., then you could technically get two negative results on each side of your actual surge. That's why some suggest testing twice a day when you get close to your expected ovulation. Also, are you guys testing first thing in the morning? If so, you might want to test later, since LH actually start building up in the morning and is higher mid-day than in the a.m.

[izzys_mom]

I tested every month for like 6 months with no positive tests at all, I thought I wasn't ovulating.
I found the problem for me was that I figured I was ovulating about 14 days before AF started, since everyone seemed to tell me that. It wasn't correct, and so usually gave up testing before I actually ovulated. The first time I used them for longer, I got a really strong positive. You may want to try testing for a longer period of time???

[tina1111]

OPKs don't work at all for about 12% of women. You may want to try a more sensitive brand or if cost isn't a problem, a monitor.

[Apes]

I have been doing opks for 5 months and would always get surges
and i have very regular 30 day cycles. but my progesterone proves
that i don't ovulate at all. So just cause you have a regular cycle does
not mean that you are ovulating. not to be a downer but thought i would
tell you my experience will be starting clomid but first have to wait for
af since doc put me on 28 day bc.