I bought a new brand of opks this month. They are the answer brand from Walmart. Every time I test with them I get an unclear result. The test line is always dark on one side and light on the other side. The control like looks normal each time but I can't tell if that means that it's just a negative or what. I ordered the clear blue digital to use next month, but has anyone else had this issue? It's with every single test strip. I've tried fmu, second and afternoon and still get the dark line on the left side of the test line 😞😩 (it's the bottom test pictured)