Is there something wrong with me

So this past month I have felt sick to my stomach I don't sleep most nights because I have anxiety about well this is going to sound dumb but being pregnant. I haven't had sex but I do the cm checks the app ask for . And my best friend is having sex . I had this crazy theory that if her boyfriends sperm was on my hand from it being on unoticeable on her bed that when I did the cm check I could get pregnant. It's a crazy theory . But I haven't been feeling right in my body my stomach is weird and I get dizzy and feel like throwing up. That happens all the time and now my period is three days late. I'm always late but never this late . Please help me