What Causes Delayed Periods Along With Nausea And Vomiting?

HELLO IM MICHELLE...I SPOTTED END OF JAN.25-28 NO CYCLE P OR SPOTTING IN FEBRUARY.. FROM JANUARY TIL I VE HAD EVERY PREGNANCY SYMPTOM NAUSEA/VOMITING/DIARRHEA/BREAST TENDERNESS! I TOOK aHPT BEGINNING FEBRUARY IT WAS NEGATIVE...I HAVENT TAKEN ANOTHER ONE YET. I STARTED SPOTTING MARCH 8 & TODAY ITS GONE. MY QUESTIONS 1. COULD I BE PREGNANT? IS THIS IMPALE NATION BLEEDING OT SPOTTING? SHOULD I TAKE ANOTHER HPT? MY HUSBAND AND I HAVE BEEN TRYING TO CONCEIVE PLEASE PLEASE HELP.. I SLEEP ALL DAY EAT ALL EVENING & NIGHT & I BE CRAVING CERTAIN THINGS PLEASE HELP ME ASAP...IM AFRAID TO FIND OUT CAUSE I DONT WANT ANOTHER NEFATIVE RESULTS. MY HUSBAND AND I HAD SEX BEFORE & DURING ME SPTTING BOTH MONTHS & IM OVERWHELNES ABOUT being pregnant. I m very moody at times & I want to be careful because we don t want to miscarry. Please help me ASAP