In that case, i would say it may be good to go for it, that was why i was going to have one as i was with my ex for 4 years, had a kid and she had one from a previous relationship that i was fathering too.  I didnt nor did she want anymore children as i think 2 is enough for me.  
What you have to remember is it is still not 100% effective in stopping the little soldiers doing their job. 
  
Be safe, wrap up well