I have a missed period, I am 4 days late. I have cramps, backaches, I'm tired more often, and nauseas, can I be pregnant? Last month I had my "period on February 21 or was it implantation bleeding? it was light and a week before that I was bloated, nauseas, headaches,cramps and had tender breast. At the moment I don't feel myself and I think I may be pregnant. Please help