Hi!! I have just posted about this in first tri! I had some spotting this am, went to docs and had to do a hpt. The line was Alot fainter than a week ago, I should be around 8 weeks so booked in to epu tomorrow. anyway I Googled it and have since fou d out that the further along you are the lighter your hpt line will be, something to do with hormones. It's called the hook effect or something. Have a look into it, it will definitely reassure you x