Cramping a week after period ??

My period lasted 4 days ended on the 11th (I’ve always been pretty short and light for periods) and all of a sudden I’ve been feeling slight cramping for the past 2 days and then today it has been worse. I’m not on birth control and my cycle is around 31 days according to glow. It only hurts on my left side, do you think I ovulated? I had sex today lol