Re: ovulation test strips hi sdevir ovaluation tests are usually taken to know when the egg will be released, you have to take the test on the 12th day i.e you start counting the day you got your period as day one, so you take test on the 11th or 12th day. you usually ovalute on the 13th or 14th day, so taking the test on 11th or 12th day would be advised. though the egg will be alive for 24 hrs, the sperm can stay inside for almost 3 days, so you will have more chances to get pregenant if you do it on the 12th or 13th day. i hope this helps. if you need more information on this you can check out pregnancycenter website.