I had unprotected sex with my girlfriend twice last month, now she is late by her periods, the due date was 18, she had some spotting from last 4 days , not periods but some bleeding. We had tested with prega news 3 days in row all the test were negative which is attached now what should I do. Her periods were normal before. But last month she was having typhoid for which she had medication more than 15 days and felt alot of weakness now she is recovered but the issue we are having is late periods.