Teepee, i havent used that one before, but i know it is expensive (around $25), and that it has been listed on FF that the clearblue digital ones sensitivity is 50mg,,,which is pretty high compared to the regular midstream ones that are usually only 25mg. I used the pregnow internet strips, and got very faint lines on them, so went out and bought fortel ultra early test (it tests from 6-7days before AF is due), and it tests at a tiny 10mg!!. I used it during the middle of the day, and got a nice dark line on it, so off I went for my BT.
That might be worth a go,,, at it only cost me $14 from the Bilo grocery store for the two test pack.
Hope this helps hun, I'd just hate to see you get a false negative just because the test wasn't strong enough
Fingers crossed for you with testing