Faint BFP on FR, BNF Fortel Extra

[Twinkie]

Ok ladies, need some opinions and past experiences with these two brands of test. I got a faint BFP with First Response this morning, but a BFN with Fortel Extra (using same pee). I have had faint lines on FR but not been pregnant before, but am praying for my BFP this month so trying to hold onto some hope! AF is due tomorrow. Anyone want to share their experience with these two tests? I know the Fortels are prone to false positives/evaps, but no line on this particular test (and I've used them enough to know how they react normally). I also know that the Fortel are 10mIu and FR are 25mIu sensitivity.
Cheers ladies