ive always thought tht first response was top of the line. but Walmart .88 were cheaper so those have always been the ones i got except for a couple of firsf responce here and there. im currnetly exactly 1 week late..last month the first weekend i spotted 2 days...10 days later i spotted again. my first 2 days were spottin then thr 3rd day was a lil heavier then turnt brown. ...havnt had a period since. week late now. im alsohaving a few pregnancy symptoms and im still gettin negative test. ivs taken 4 walmarts and 1 first responce. all 4 walmarts have showed a 2nd line after a while. the first responce showed nothin(few days b4 period) the last test i took was day before yesterday and it was a negative..any ideas? ......whtsyourexperience with walmart cheapies and first respince?