Pregnant ?

So I'm extremely sick to my stomach almost all the time for about a week. The only foods that haven't made me sick are deserts . I haven't ever been this sick to my stomach before . I took a pregnancy test and it came back negative , but I think I took it way too early, I haven't missed my period yet. I am on the pill and have been for 3 years. I also am experiencing constant urination. I haven't felt this way before . Please help with any advice .