When should we have another baby?

Countryboy95
I been with my wife for 12 years been married for almost 8 years. We have a son who's almost 10 we were 15 and 18 when we had him she's been talking about having another one. She got on birth control when he was 5 she still has 2 more years with it. She's worried it might be too late to have another one since our son is getting older. Should we have another one? What are the chances of getting her pregnant on an IUD?
When should we have another baby?
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