There are a few reasons you could not get a positive test one month. When it comes to your ovulation test stick, faint test lines could mean that you missed your window for an LH peak or surge this cycle, you might not be ovulating every month, or your LH levels might be <25mIU/mL (and using a sensitive test to establish a baseline and track for a peak or surge will help to identify your fertile window). Tracking your ovulation each month with our ovulation predictor tests will provide you with results to make informed decisions based on your unique cycle.