Superdrug vs frer?

[Notmymuse]

Why does superdrug say you can test at 4 days before your period is due but have a higher sensitivity than first response early response which says you can test 6 days before.

I'm 9dpo and had a very very faint positive on the first response this afternoon (but have had fertility treatment so could be trigger) checked again a couple of hours later with a superdrug one and nothing. The first response one is very pale but came up within three minutes and I can see it pretty easily.

dud you use the same first morning urine to test both? If you used wer from later in the day for the Superdrug one, it'd be less concentrated so not as likely to show a line.
But a line is a line. And the FRER ones are great for early detection.
If you have a spare try again tkmorriw morning - or if you have nerves of steel, wait til the sag yiur oeriod is due for a more definitive answer.
Good luck!