I got a pos on a dollarama test, neg the same day on accu-clear and CB digi, neg on first response the next day, and then a positive the day after that on a first response and 'pregnant' on a CB digi the day after that...sometimes the HCG levels aren't high enough to pick up on the more expensive tests. I would test again in a couple days with a more expensive test. Good luck!! False positives are very rare but false negatives arent!!