fertility check

I'm 37, TTC #1 for a year now with my SO.  I am going to my doc next week to get a referral to a fertility clinic.  I'm worried that I'll go and they will tell me I can't have babies.  Does anyone know what the chances are for a woman to not be able to have kids?  Am I worrying for nothing, like I normally do.  I'm not sure at what point my SO will say it's too hard to have a baby and give up.  He wants one more than anything and I'm pretty sure if I can't give him one, no matter how much he loves me, he won't be able to be with me if I can't give him a baby.  So I'm really nervous.