It depends on how irregular she is. I don't know how long or short hers are. Sometimes cycles can last for 40 days. If she thinks she is missing a period, or it's been 50 days since her last period, then she should take a test.

Or she could just take a test in about a week if is worried about pregnancy.

? how late can she get?

well she took the test and it came out negative during the night. So i think everything is ok but she still hasnt had her period and she is about a week late now.

irregular period perhaps

so that means it can happen anytime?

yes you can have an irregular period. its common and it happens alot

ok thanx.