Hi I Am A Young Woman And I Am Having

Hi I am a young woman and I am having problems with nausea. Lately I have been getting so much nausea but the only way it goes away is when I eat food. Then it goes away....but on the other Hand my boyfriend thinks I might be pregnant. And I don't think I am but I am scared and it's freaking me out. We have always had sex protected never unprotected and we have always been careful. The last time we had sex was the day before I started my period and we used a condom then the next day my period was here. The day I ended my period my boyfriend and I started fooling around, he thinks that he might of had precum on his fingers when he fingered me. Him and I are very worried...we are getting pregnancy tests tomorrow but if they turn out negative should I go to my doctor just to make sure? And ask him about my nausea and why does it go away when I eat food. I am just worried....And I need advice