FRER vs. Walmart/internet cheapie

Tay • 🌸TTC 🌈👶🌸

A friend told me she always got a BFP on the cheapies before the FRER. WHAT?!! Af was supposed to show on the 13th. I took a walmart cheapie yesterday And today and nothing. Should I test with a FRER? Also, has anyone else gotten a BFP on a cheapie before a FRER??