How long after implantation should I get a positive test? Period is late by 9 days but I could’ve conceived on the 24th. Took two tests, one on the 29th and one on the 3rd. Both negative. Had light cramping for the past two days and the faintest amount of blood when I wiped this last time, barely enough to turn the paper a faint pink (this was before I peed so it wasn’t watered down or anything). I’m waiting to see if it’s my period, and if my period doesn’t come then I will test again but I’m wanting to know when I should test.