Hi, I am 23 years old and have been with my partner for 4 years. We haven't been trying for a baby, but have not been using any contraception for nearly a year. My periods are usually very heavy,but last week I hardly bled at all. Only a very dark brown spotting that was wiped away after I had been to the bathroom. This only lasted a couple of days in the morning. There was no need for a tampon as there was hardly anything there! I don't feel nauseous so surely I can't be pregnant, can I?