I really don’t fucking get it.

I am 20 years old. Have a 2 year old. Why am I not ovulating ? Or getting fucking pregnant ?! We BD almost EVERYDAY or at least every other day. Wtf ? Doesn’t add up. Going on month SIX of trying. I know most people try longer but I got pregnant first month with my son. And I am 20. Young as hell. Why am I having so much trouble ? I’m about to say fuck it and be done ! Like I have one atleast so whatever