Since february of this year I havent had my period

Hi, since february of this year I havent had my period. In march i bled for less than 24 hours and in april, i bled 5x in 3weeks for under 20 minutes, I went to urgent care and told them my issue. i told them that i dont read by urine and that i read by blood only. With my first pregnancy, i didnt know i was pregnant till i was 9 weeks, 5 days and now this is my issue, i havent been stressed at all. Every 8-12 hours my abdominal muscles twitch aroud the sides and down near my groin area. If i ride in a car or any type of vehicle i feel sick if i look out the windows but if i keep my head down i am fine. I have never,ever been carsick in my 23 years of life!!!!!!!!! can someone please tell me what the hell is going on with my body, my nipples are tender, my areolas seem to be getting bigger and darker, im constantly hungry, moody, and tired. I want to know what is going on. my father in law did the needle on a string thing and it showed twin girls, however what do i do if my blood test shows negative and i still feel this way, will they end up doing an ultrasound JUST to find out if im pregnant, again please help me i cant stand the urge of vomitting in the car any longer. thank you