Has anyone heard of women getting a positive OPK for 7 days? It could have been longer but I ran out of tests. I tried two different brands. The first month I tried it, I ran out of sticks at 7 days, the next I ran out of sticks on the 6th day. I had an early miscarriage in June, and have been desperately trying to get pregnant. I have two other kids so I have been pregnant three times. All three times I have been pregnant on the first try. So I am really worried. Any help would be appreciated. Also the pregnancy that ended in miscarriage, I took an OPK and it was positive for just one day. We had sex for the three days after I got the positive and I was pregnant. My cycles then were about 24 days and I got a positive OPK on day 5 of my period. Now my periods have been 29, 29, and 25 days. The last two months I got my first positive OPK on the 10th day then the next month on the 12th.