My ex girlfriend dumped me and wants me back. she is really depressed and stressed due to family problems. she had a 3-4 day period that was lighter than normal. she has taken 3 home urine tests and a urine test at an urgent care and all came back negativ

Not sure of ?: The main reason for light periods is change in hormone levels. Causes for what seems to be a light period can include: thyroid problems, stressm eating disorders, excessive exercise, initial periods for a girl, use of an intrauterine device, oral contraceptives, perimenopause & implantation bleeding in early pregnancy which rarely occurs.