Am I not going to ovulate?

Lindsay
My average cycle length is 32 days so I should ovulate on cycle day 16 right? I've been testing twice a day and I'm on cycle day 19 with still nothing. How long should I keep testing before I can be sure it's not going to happen? I've only been doing opks for 3 months and I've ovulated before now in other months. Is this cause for alarm?