This is not my test, need advice please 🙏🏻

Angela • 44 yr old Mother of 3 older children to previous marriage & a 4 year old boy to my partner of 5 yrs, ttc no 5 for 2 years, did fall pregnant last year in June but lost the baby at 12 weeks. Now Just had my baby boy Heath William 13/03/20 😍

My daughter has been throwing up off & on for the past 2 weeks, she's been dizzy etc, not on the pill & in a relationship, she took these tests last night, she can't remember when her last period was she thinks it was end of August, I tweaked the test for her, looks neg but there is a weird line??