help me

Ok for the past week I have felt like I'm gonna puke. Last night I was laying in bed with my boyfriend and I felt like I was gonna puke and I started shaking really bad and crying. I don't know what to do I feel miserable I seriously feel like I'm gonna puke all the time. He and I are going to the beach tonight. And coming home on Sunday while we are out buying groceries I think I'm gonna buy a pregnancy test. I hate feeling like this. Someone please help idk what to do.