What should i do?Am i just really sick?

Okay so it was either last week or the week before that i first threw up,i had been feeling nauseous for three weeks but this time i actually threw up when i had just finished eating a bean burrito.It didn't last in my stomach obviously and it happened around 3 in the afternoon.Well second time i threw up was yesterday, it was only 11 in the morning and it looked bright yellow like the egg yolk my fianc�e had made for me the day before.And then today i wake up and feel bloated and sick and it was 12 in the afternoon when i threw up and it was just clear like saliva.Couple things are different about me now,i never want to eat because when i eat i feel nauseous and sick,and when i eat pretty good and i'm full i feel sick later.And when i do eat i don't feel hungry really i don't know if its the nausea that takes over my stomach making me not hungry.I just cant win.Also when i feel sick to my stomach i have some little pains in my stomach.And then along with this a couple days ago i was spotting it was somewhat dark red i thought for sure my period is starting because about two weeks ago when i was feeling nauseous i was spotting too and had sore that whole week but never did get my actual period.So i thought this week it is.Well the spotting has only gotten lighter and smaller.I do spot before my period and then get my actual period couple days later and my period is usually always a heavy flow.So spotting again?And two weeks ago too?I don't know.Along with feeling sick and nauseous?.but I've only thrown up three times now. I've even try to just get some fresh air and that just makes me nauseous.Ugh.Its not like me.Even when i feel sick i never throw up,if i ate something i still wouldn't throw up.So me throwing up has got me a little worried along with all of this.And also i get a ball of phlegm in my throat sometimes that hurts.My fianc�e thinks i'm pregnant as even he knows this is a change.But i doubt it because i don't think i can get pregnant.What should i do?