Yes it can, mostly false negatives if you test too early or with diluted urine. False positives are rarer. Use first morning pee and test after missed period for the most accurate result. If unsure, repeat after 2-3 days.
Mine showed negative first then positive few days later! So yes home tests can be wrong if too early. Dont lose hope or panic from one test, wait a couple days and check again, or get a blood test.
Definitely. Testing too soon, expired kit, or not following timing on the box can give wrong reading. I got a faint line that confused me, so i retested after 3 days and it was clear. Blood test confirms it best.
Yes beta they arent 100 percent. Early testing or wrong timing trips them up. If your result confuses you, dont stress, redo it after a few days with morning urine, and let the doctor confirm with a blood test.