Confused

Hi all,

I have been trying to get pregnant but my period hasn’t started yet since my removal of birth control. Last week I started to have strange smell aversions creating me to throw up. My nausea lasts all day. I am tired and have a constant headache in the back of my head. My breasts are sore and very sensitive. I know it could be PMS but I haven’t had any result of a period. I did take two pregnancy tests both were negative. Any thoughts? Thanks