I have done 3 tests in the last 2 days. I have pregnancy symptoms like vivid dreams, slight nausea, heavy feeling in uterus/ slight cramps. I am 9dpo. All three of the tests have developed these lines after about half an hour. I know they could be evap lines but why have all 3 of them done it when the previous two I took a few days ago didn't develop any evap lines?? They are all from same box.