ovulation day but no signs?

According to the glow app and ovulation calendars online wednesday was my ovulation day and some calendars that I tried said tuesday was my ovulation day. We BD on Sunday night, Tuesday, and on Wednesday (ovulation day) but I felt no cramping on ovulation day also had no discharge the last few days... felt a little bit of pelvic cramping on Tuesday.   Is it possible to ovulate without symptoms? And how accurate has GLOW been for you?