Ovulation...?

Hello! According to Glow, my predicted ovulation date is today. My partner and I BD on Thursday (like 2ish am). However, I noticed I had CM on CD 15/16, which would have been Mon/Tuesday, no more since then. I've been taking opk's since Monday and they all have been negative. I have a 32 day cycle by the way. Is it a chance I ovulated on CD 15/16...? I haven't tried taking temps and all that stuff. Advice, thoughts...? Thanks!!!