The Plan B could have caused her to have the Second bleed as it damages your body and isnt really advised. So please dont have her take it anymore.. Use the Pill AND condoms :). You CAN have periods whilst pregnant this is rare but does happen,my mum is a walking example for this.
she can take a test with First morning urine to get a result!
plan b. really messes up you'r body. and why would she have any reason to have taken it If it Was protected sex and condom didn't break. i doubt she is pregnant. but If she wanted to she could test and get accurate results.
Its possible but doubtful. Have her take a home pregnancy test and if it tests negative wait a week and take another.
you said she got her period a week after having sex, and that made it her second period...
Was that period lighter as compared to usual flow, because sometimes implantation bleeding which also occurs a week after sex can be mistaken for a period...
From what you say.. she has not had a period for around 7 weeks now.. she can take a home pregnancy test by now to confirm..
if she has had a period since you had intercourse then no i wouldn't think she would be pregnant. If she hasn't had a period in the full 8 weeks then i would advise her to see a doctor, otherwise you have nothing to worry about