I Found fortel very unreliable. When i wasn't pregnant they gave me false positives and when i was pregnant you could hardly see the 2nd line. I used crystal clear with this pregnancy and it was a definate positive 8dpo! Also they come highly recommended by Doctors, when i went to my GP he said he had some bad experiences with Fortel, patients thinking they were pregnant but wern't, he said crystal clears were the ones they used in the surgery.