Hi all need a bit of help or advice please, this is my 3rd month ttc and have been using clearblue advanced opk, so today is my 5th day testing but the last 4 have been flashing and i now have none left not sure if i will get to the shop today to get more and only have internet cheapie opks. its only ever flashed for 2-3 days in the past cycles not sure why its now 4? would u buy another box now or just keep trying and use internet cheapies? hope this makes sense x