Ovulation Testing Help!

So, we had to take a break from trying for the past 5 months due to some health stuff. Starting back in full swing with this current cycle. When do you ladies start testing? Before all of this craziness with my lady health, I ovulated between CD11-CD13, i had a 24 day cycle, and I always knew when I did due to CM, cramping to one side, and mood swings(odd I know). Now I have no clue when to even start testing. Day after last mental day, a few days later, I have no idea?!