Annoyed.

Last time I saw my fiancé was two months ago and I haven’t had sex since. I took a pregnancy test today and it’s negative. So I can officially say my stomach hurts, I’m nauseous, cramping, and no appetite for no reason. For the past few days almost a week now I’ve felt like this. Why would I have all these symptoms when I’m not pregnant??? I’m 19, I have birth control in my arm and I don’t get my period anymore