So yesterday I gave Wondfo a call and asked about my test results. Everyone kept trying to tell me that it wasn’t positive, even though in person it clearly is. My test line had a dark skinny line on the left side which is as dark as the control, but it faded to lighter on the right side. Wondfo confirmed that you compare the darkest part of the test line to the control line, and if ANY part of the line is as dark as the control, it’s positive. It may not be this way for all OPKs, though. Just wanted to give everyone a heads up in case they experience this, and doubt their results!