My 16 yo daughter last had a period in late November. She just told me two days ago when she confessed she d slept with her boyfriend, though he used a condom. I m very worried and ran out and got a First Response pregnancy test, which turned up negative. This morning, she texted from school she got a very stringy, gooey, clotty, bloody discharge that bled right through her pants, so she tied her hoodie around her waist. We thought she d finally gotten her period, but a few hours later, it stopped. She normally bleeds every month, though it can run a week late. She has no symptoms of pregnancy, save breasts that feel a bit heavy. Should we be worried?