Do antidepressants affect male fertility?

Rachel
My hubby and I have been ttc for 4 months now. Coincidently, he's been on an antidepressant for the same amount of time (celexa) and I'm concerned it's affecting his fertility? 
We have a two year old son, and conceived the first time we tried. 
Anyone have experience with SSRI medications being linked to fertility issues?