Anyone know anything about opks ?

Been ttc for a year now :( found out partners sperm count is abit low.... Any ways I used to do opks and thing but o stopped I started agin this month after so had been taking vitamins. I always used to get a positive then maybe 4-7+ of positive after that. This month had my first positive yesterday then today went negative already. Can this mean a thing ????? Or reading into things to much. Thanks guys !!