Sorta? If there is a problem with my math, let me know about it. If you have no corrections or don't even understand the math involved, don't hint that you do. I'm not making predictions here. I'm calculating the failure rates for these birth control methods.
I picked the two most common and easily accessible forms of birth control to use for my example. IUDs are generally used in women who have already had a vaginal birth and require a minor surgical procedure to insert. So not the most universal form of birth control.
IUDs are no more effective than birth control pills taken with perfect use, but since you think my stats were "blown out the window" for some reason, let's do it again:
failure rate of IUD: 1/1000 per year times failure rate of condom 4/100 per year = 4/100,000 or 1/25,000 chance of getting pregnant per year. So suppose a couple has been married 10 years, using a condom all along (yeah, super realistic I know) The odds of getting pregnant during that time are 1/2,500. Like I said, it's unlucky but definitely not unheard of. So it's kind of sad that you hear this story and immediately go into a mindset that it's either a lie, or the woman screwed up somehow.