Tulsa - When women ask for birth control, they have to read the fine print. You can still get pregnant.

All you have to do is ask 19-year old Samantha. She says she was taking a birth control shot every three months until recently.

"They told me that I could not get my shot, because I was pregnant."

An ultrasound showed she was having triplets.

"I pretty much told them they were lying. I told them to have someone else do the ultrasound and get it right. Because there was no way I was having triplets."

One doctor estimates, she had a one in 3-million chance getting pregnant at all. But apparently it can happen.

"I think we always tell women that no method, short of hysterectomy or absolute abstinence which is for most people not realistic is 100% guaranteed," says Dr. Gardener with OU Medical School.

He says, men and women make mistakes, missing a date for a shot, or forgetting to take a pill.

"Typically over a period of two or three years most women will skip a day miss a day that's just human nature."

He says, the pill is effective taken the right way. And the IUD, which is inserted into a woman's uterus, is making a comeback.

This mishap has Samantha stressed. She's even considering letting a family friend adopt one of the three girls.

"I've been thinking about it since the day they told me I was having triplets," says Samantha. "I'm a little scared taking on three babies by myself."

But she loves them. The two that get tangled up. And the one that sucks her thumb. And even for her, it's hard to call this big bundle of joy a mistake.

So what should women do if you're not sure which birth control method is best for you? Ask your doctor. They have a lot of information at their fingertips.

Doctors tell us the most effective contraception is male sterilization, then the IUD, followed by the Depo-Provera shot.