Flashing Smiley CB Advanced?

Natalie

Glow predicts I’ll ovulate in 5 days. Yesterday I got a flashing smiley on my CB Advanced. Easy@home OPKs were negative. Today I got the blank circle so I’m confused! OPKs negative again. Last month I got positive OPK and flashing smiley for 1 day, then solid smiley and positive OPK the next day. So was the flashing smiley yesterday false?