You asked

Do ovulation predictor kits really work and improve chances of conception?

Yes, they do. Good kits can be bought over the counter and work by measuring the amount of luteinizing (LH) hormone in your urine. The presence of LH means that the brain is telling the ovaries to release an egg.

The kits don't last forever. They have a shelf life of about two years, so be sure to check the expiration date on the box. Prices range from about €7 to €25, depending on the brand and the store. Most come with a five day supply of test sticks. Your job is to urinate on the stick and then wait for a line to appear. The instructions show what colour/shade indicates that ovulation is imminent (within 24 to 48 hours). If it’s too close to call, retest within the next 12 hours.

If you're having a difficult time with the kits (is it the exact colour that is on the box?) you could try one of the small electronic monitors. It reads the results and can tell you even earlier when to expect a surge in LH. However, take into account that these monitors are expensive and then decide whether it is worth it to buy one or not.
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More questions

The best timing for pregnancy testing is once you miss your period.
Ectopic pregnancies are fertilized eggs which implant themselves outside of the uterus. They must be terminated and can indicate future fertility issues.
Ovulation is the period during which you can conceive. Tracking ovulation can be tricky, but you can increase your chances of conceiving through math, prediction kits, or simple scientific observation.
Implantation bleeding is not a common experience, but some women do report small amounts of blood with or without cramping roughly a week or less before their anticipated period.
Pregnancy tests are only as good as the execution. Read all instructions to avoid getting inaccurate results on a home pregnancy test.
The best over the counter kits measure luteinizing hormone (LH).
There are many things that you can do to increase your chances of getting pregnant.
How STD’s can affect your pregnancy, your baby and how you should deal with them during pregnancy.
Taking care of your body before and during pregnancy
Ovulation occurs just about two weeks after the first day of your period.