The plan b pill will always cause a disturbance in a girl's cycle. That means either she won't get a period, or she will have spotting, or she will get a period early. Any of those can happen. Her problem is not pregnancy, she is just having side effects from that pill. I wouldn't worry about it.
so should i gotp dr. for check up of my gf pregnancy.. becoz home test show us negative results
Sometimes that morning after pill can do funky things to a girl's period. How long does her cycle usually last? (Day one being the first day of her period, last day being the day before her next period.) Are they always regular or does she have irregular periods, meaning the length between periods varies drastically? Chances are, she's late enough that a pregnancy test should pick up if there is a pregnancy, but so long as you used condoms properly, she already had minimal risk. The morning after pill would only have really made a difference if the condom was used for more than one time or if it broke and she took it within the 72 hour time period.