TTC but I want implants, should I wait?

My husband and I have been TTC for almost 16 months without any success. One night we got on the topic of breast implants, which I have always wanted since I'm a very small b cup. I know many women with implants have children, but my question is: how did your breast implants look after going through a pregnancy? 
Mine are very small now, and I don't feel like they would grow too much during pregnancy but I'm concerned about sagging afterwards.
I know it's "ideal" to wait but I've already put if off for almost 2 years. Thoughts?