I was supposed to start my period today, but I didn't. I took a test the 14th and 15th and they both came back negative. I spotted the 10th and till midday the 11th, since then I have felt extremely nauseous, especially when I haven't ate for a while, and today My breasts started to hurt a little bit. Could I have tested too early? I used the first response 6 days sooner.