Cramps, pregnancy or ovulation?

My husband and I aren't trying to get pregnant but aren't trying to prevent it either. Per Glow my ovulation day was Sept 29. We had sex twice that day and he came inside both times. Today I am having faint cramping and have been extremely moody yesterday and today. Period isn't due for 11 more days. Could these cramps be inaccurate ovulation from glow?