Community post

If the second test is a different brand, it may have a higher sensitivity than the first test, so you could be pregnant but your hcg levels aren't high enough yet to register a BFP on both tests. Try posting the tests in the image gallery so we can vote on it. You don't mention how many dpo you are, but if it's still early try again in a few days. You could also try a digital and see what that says (but I would wait until closer to when AF is due to try the digital for more accuracy).