Hi, I'm 18 years old and I haven't had my period in 3 months and I took a pregnancy test (3) and 2 of them came out positive but I stared my period yesterday out of the blue and my stomach hurts super bad and when I have to go to the bathroom I'm having horrible diarrhea and when I'm standing I feel like I'm going to puke or pass out, also I start getting hot flashes randomly and need to sit down or get some fresh air... what's happening exactly? Am I pregnant? Do I have a flu?