How To Treat Menstrual Irregularity?

HI MY NAME IS TERILYN AND IM 17 YEARS AND I NEED YOUR HELP OKEY. FOR 2 MONTHS NOW I BEEN HAVING SIGNS OF PREGNANCY LIKE, MOOD SWINGS, CRAVINGS, SLEEPING ALOT, BACK PAINS, AND LAST MONTH WHEN MY NOV. CYCLE WAS SUPPOSE TO CAME ON, IT WAS 2 WEEKS LATE BUT AROUND THE TIME IS WAS SUPPOSE CAME ON I WAS CRAMPING AND I SPOTTED VERY LITTLE. THAT WHOLE NIGHT A WEEK LATER MY COUSIN BOUGHT ME 2 HOME PREGNANCY TEST AND IT BOTH ANSWER NOT PREGNANT BUT AFTER MY CYCLE FINALLY CAME ON 2 WEEKS LATER MY CYCLE ONLY STAYED ON FOR 3 DAYS UNUSUAL BECAUSE MY CYCLE USYAL STAY ON A WHOLE WEEK. IM STILL GOING THROUGH MY SIGNS OF BEING PREGNANT I THROW UP EVERYTHING I EAT MOOD SWINGS SLEEPING MY BUTT OFF BREAST OR GETTING BIGGER STOMACH PAINS AND SCARED TO TELL MY MOM PLEASE HELP ME