Felling kind of down...

So, we have been ttc for 5 months now to no avail. I have PCOS so I have to take meds to even have a chance. Besides that, my beautiful little girl has become a "threenager" or so the experts are calling it. Never had terrible twos, but this phase she is in has been really hard. My husband and I also don't seem to be communicating as much. He started a new job last June and rarely gets home before 7:30/8. I teach and leave the house by 5 so I'm exhausted by 10. I don't know, I'm really considering putting ttc on hold until this passes... I don't want the age difference between my daughter and a new baby to be too much, but I'm just not sure. Thoughts...