very faint bfp on ebay tests

hi there, this is my first post and would like to ask of your opinion please if possible.

This is our first month of ttc after i have been ready to start ttc for the last 2 years but only just got finances and OH up to speed. As it is my first month I cannot be sure what day I ovulated, however I believe it to be the CD 17 or 18 by checking cm and average cycle length. We put in extra effort in bding and think we covered the fertile period ok. I am now on cd27 and this is the 3rd day I have had cramping and shooting pains, they are a lot less today than 3 days ago and also the other symptoms are very hard sore nipples and indigestion I took an ebay pregnancy strip test on cd25 and today on cd27 and both showed very faint lines within the time period allowed, although neither showed up very quickly. As I am unsure what day I ovulated I am finding the waiting game unbearable as we want this so much. Do any of you have any experience with the ebay tests? I know the only thing to do is wait until my af is due (on tuesday) but to be honest the wait is making me feel sick.

I hope you're all having lots of luck this Christmas and New Year!!