Can taking plan B twice in a cycle cause infertility?

Ok I will provide some details here...

I have taken Plan B 4 times now.

I was on birth control before any of this happened, and when I quit the birth control is when these details begin.

1. September of 2010 (i did the 2- pill thing in the pink package)
2. Beginning of December 2010 (plan-b one step)
3. December 20, 2010 (plan-b one step) (Same cycle as previous pill)
Then I was on birth control for the entire month of January (azurette tablets)
4. And Today, February 1, 2011 (Plan-b one step)

My question is:

With the time frames that I was on birth control, then took plan b- with two of them in the same cycle- then on birth control for a month, then 2 days after birth control pack was finished, took another plan b pill... I'm very worried about whether or not this could cause infertility?

I do not plan to get on birth control right now as i am very scared and don't plan on getting sexually close with anyone until I figure all of this out.

I'm just really worried about the possibilty of infertility. Could plan-b cause infertility in my situation??

Thank you in advance!!

[Elaine Brown, MD]

Hi!
The effects of both Plan B and oral contraceptive pills are temporary.  Neither will cause permanent infertility.  Both are definitely preferrable to unwanted pregnancy!  Chlamydia ( a sexually transmitted infection) CAN cause infertility, so use condoms too!
Good luck!
Dr B