Do you have to have EWCM to be ovulating?

According to Glow I should have ovulated Monday. I usually have EWCM around the time that I “ovulate.” I was a few days late for my last period, so I just assumed Glow was off on my ovulation prediction. I had a TINY bit of EWCM yesterday, but it was also mixed with some creamy CM as well. I took an opk yesterday evening and it was negative, but didn’t look far from positive. I have not tested today, but I will later this evening. I still do not have any EWCM today. Did I just not ovulate this month?