Hello I am 17 years old and lost my virginity on April 15. We had unprotected sex, but I used the yuzpe method of emergency contraceptive the morning after. I got my period one week late on April 23. It was normal flow lasting around 6 days. I then got my second period on May 26, which was also normal and lasted around 6 days. A week before the second period I had pregnancy/PMS symptoms like moodiness, sugar cravings, and achy breasts. This was weird because I usually never get any symptoms before my period. At this point if pregnant, I would be around 12 weeks. I recently developed a faint linea nigra, have been having digestion problems (lots of gas and stomach rumbling), and when I went to the doctor for the flu he told me I have an enlarged thyroid. I have also been gaining weight lately, which includes my love handles, but do not have a bump at all. I also have increased burping, fatigue, dizziness, diarrhea, and sometimes migraines. I also took 3 pregnancy tests at weeks 9, 10, and 11, which were all negatives without even a faint positive line. The week 10 pregnancy test was done with morning urine. Could I still be pregnant with my period and these negative tests? My biggest worry is this linea nigra??