Clearblue is a very distinguished brand, the digital ones have a good reputation for giving the correct result. However they are probably one of the more pricey HPTs on the market, upwards towards $20!!! What i'd do is try a cheaper brand (First Response is a pretty reputable brand in the US, and price is round $8-9 for a 2 pack, if you test now and geta BFN, you'll still have 1 test left to take later on on Vday!) if it looks like a positive, go ahead and get another brand (like clear blue) to confirm it!