5 test positive frer negative still

Danielle

Took 3 brands that showed up positive in the timeframe ( 1 clear and simple.1 one-step a nd 2 promatris ) I went out got a frer as was excited to see2 lines on each test (for the last 3 days iv had lines on each one and take one of each brand at a time )and frer is negative what could be goin on.last 3 days iv had positives on the cheapies but not on the fter with some line progression on the vheapies