OPK Clearblue Easy Advanced Question

Ok question for you ladies.  I am using the clearblue easy advanced opk's and have regular 26-27 day cycles.  I tested last night at 8 pm and got an O, then tested again at 2 pm today and BAM A SOLID SMILEY.  So naturally as both as both of us were home we BD'ed ASAP.  according to Glow & My Maybe baby app I am not due to ovulate until Tuesday or Wednesday, I am currently CD 12.  Any chance I may have gotten a false positive smiley face?  FYI, bbt is still low (97.5).....post ovulation it goes up a whole degree like clockwork and CM is plentiful and egg white in consistency.  Anyone ever had any false positives with this opk??