I just feel low!

For the last 5 months I have been so on board for trying for another baby. My daughter was concieved so easily 3 years ago. I'm only 23 years old. My partner ( craig) feels like it's his fault when honestly it has to be mine. Af is psycho and can't decide when she wants to be here so my fertile window is never the same anymore. My birth control messed me up. I just need advice.