Hey man you'll be pretty good the chances of getting pregnant on just the IUD is very slim >1% so the condom would just be mostly for the prevention of std speading. If you wanted to use one feel free. But it won't be twice as effective.
yes they had sex without a condom
Put a hole in condom.
Excellent.
There's a 25-75 chance favoring that you would not get her pregnant. You could use a condom and not get her pregnant, or you don't use a condom and you have a chance at getting her pregnant.
there could be a possibility but it is very much rare to get her pregnant.
50/50
the probability is very small
I wouldn't think so...but its always possible I suppose
yes.
20 percent without condom
The only "birth control" that works 100 percent is Abstinence. But a condom will help prevent it, without a condom you have a low percent of not getting pregnant.
Condom are considered to be 90% to 97% effective (depending on who you talk to). So even with proper condom use you have a 3% to 10% chance of getting pregnant. Most sources favor the 97% figure.