GF forgot to take last "active" pill

[chips2011]

My gf and I have been seeing each other for the past year now and she has always been on birth control. I always used condoms all the time when we had sex. Until this passed weekend her last "Active" pill was supposed to be on Saturday but she lost the pill and did not take it, but on Friday around 11:00pm or Saturday 12:00am we had unprotected sex for the first time, I did not ejaculate inside of her that night. She starts her sugar pills on Sunday but normally she does not take the sugar pills she just waits the following Sunday to start her "Active" pills again.  Though she was freaking out because normally for her period usually begins sometimes two days after she stops taking the "Active" pills. So she decided to take Plan B on Monday around 7:00pm. If we are correct on this she took it within the 72 hour time frame (please correct me if I am wrong).  What are the chances of her becoming pregnant if she skipped the last "Active" pill and took a Plan B two days later? Is the possibility still there?

[chips2011]

Well, no she didn't take the VERY last "active" pill which would be pill number 21 to be exact. She was about to take it but she dropped it and couldn't find it that Saturday after we had unprotected sex earlier that night around midnight, though she told me she didn't miss any of her previous pill that month and also the previous months.

She is really good at taker her BC and almost always at the same time. So she didn't tell me this until Sunday night, she didn't think it was a big deal but she freaked out cause she normally sees her period like +/-48 hours right after she stops taking her active pills. She normally gets her period like two to three days after she stops taking them which is worrying me now because it's almost Friday now and she just took the plan B on Monday evening during the 72 hour time frame.

She is under alot of stress at the moment with her school and such but she told me even in the past when she was under alot of stress she would always get her period right on the dot with no delay.  

[thatquietgirl]

She definitely took it within the time frame; however, the longer a person waits, the greater the chance Plan B could fail to work.  However, she should be fine as long as she was taking the pill at the same time every day and didn't miss before.  Did she take the last active pill as soon as she remembered like you're supposed to?

Anyway, the chances are small.  Make sure she is relaxed and not stressed out.  That can delay a woman's period.  I know whenever I've had a pregnancy scare, my period usually came a day or two later than usual.  Also, if she's sick/getting sick, sometimes it can be delayed.  And Plan B also affects menstruation.  Have her continue with her birth control as normal and continue using protection, but if she doesn't get a period at the end of that pack, have her take a test.