D.M.
I bought 30 days worth of fertility strips online for really cheap and when a got a 2nd line on one of those I used the First Response or Clearblue Easy ovulation kit (you can get coupons for both online). It saved me some money and I got pregnant the 2nd month w/ my 2nd child. I also used the kits the 1st time I get preg. and have recommended them to friends. As others have said, just follow the directions to a tee. Good luck!