how can I calculate this

So I haven't had my period over a month now and my partner and I are trying to conceive! I've taken multiple pregnancy tests so I know I am not pregnant and I would like to know can I still get pregnant 🤰🏾 without my period being present for over a month now??? 
I don't know when to try to conceive not knowing where my period is or when I'm fertile the most? 
We have been trying everyday Day no luck yet! 😞