first response test?

hi was wondering if anyone knows If you can get an evap on frer tests? they're a second line but vvvf (tho hubby can see it) it has slight colour . don't know when periods are due as haven't had a proper one since a last misscarrige in may ana can't post a pic as really light. was going to do a test in morning with fmu as peed a few times before that test. the hospital want to see me for bloods money so a guess we'll know for sure then..was just to see if these tests do evap lines thanks x