Any teachers out there who are TTC? My question is for you!

Rebecca
To make a long story short, I have been doing leave replacements for three years. This past year we had been TTC with no luck. I now accepted a full time tenure track position starting in the fall and I dont know if I should put off ttc at all. 
Keeping in mind you never know when itll happen, would it be bad to take maternity leave at the end of my first year?
I am so conflicted about what to do. Part of me wants to wait, but the other part says just keep trying and if it happens I will deal with the job situation then.
Anyone else gone through a similar situation?