Bought some eBay cheapies Did 3 the day I got them (Friday) as I had 4 days dark brown bleeding (small amount) BIG BFN. Went to bed woke up at 8am took another right away got a vvvvvvvvvfl took another an hour later another vvvvvvvvvvfl. Took one in the afternoon BFN? I can see them within 3-5 minutes need a bit of help from a light but I'm sure they are there.. Should I just keep testing?