pls help -am I pregnant???

I thought I was pregnant because I missed my period so I took multiple pregnancy tests. They all came back negative, so I took a blood test and it also came back negative (it's been 4 weeks since my missed period) I do have Paraguard in but something is just telling me I'm pregnant. These are my symptoms:
I'm peeing a lot more often
My nipples are itchy
I'm craving such bad food and things I hate (onions)
I have cramps
My belly button was hurting 
I got sick
I'm nauseous 
My hair is growing a lot
I'm getting super emotional over small things.
Pls help if u know anything about false negatives or whatever.