can I even get pregnant now?

Melissa • Mummy to an Angel baby Alfie born sleeping 27.11.16 👼🏼💙
I'm so confused. This is the first month i have started using ovulation tests.
My cycle is usually 28 days exactly and always comes dead on time. 
I'm currently at day 20 of my cycle and I have been testing from day 12 and still no sign of surge or ovulation. 
I have been using clear blue digital so it's said no surge at all on every day (I tested every day for 8 day) 
Is it possible it could of happened earlier and I missed it? 
I'm freaking out that I'm not ovulating at all and maybe that's why we haven't got pregnant in previous months