Who tests after having their surge????

Amanda • From Wolverhampton UK, happily married ❤ lost baby #1 in January but baby #2 is sticking like glue 😍
Had my OPK dark line peak 7 days ago and been monitoring my levels most nights since and I'm still reading a faint line (or am I going mad and seeing things) ... does anyone else test after their LH surge and is it normal to still get a albeit faint reading ?? Thanks :)