confused .

okay, so it's been about a almost a week that me and my husband had been trying to conceive & I've been feeling sick like wanting to throw up and stuff & like I been cramping & I took a pregnancy test but it came back negative can anyone give me some advice on what to do idk if it's just me cuz I want this so bad or if it's really happening & this is how pregnancy starts off ?? or can u start to feel anything After a week or ??