according to our embryonologist friend...a brand called ovu-quick is the best. But it is way expensive and hard to get, and apparently you need to actually BE a chemist to make it work. So...he told me the next best one was the clear plan. In the pink box, with the baby on the front. There are 7 tests in it. The target by my house has them for $17.00/7 pack. I had to go through two last month. But I had a surge!! So I was pleased with it. I fyou have regular cycles you should only need one pack.