Hi. I have a problem. Two weeks ago, on the thirteenth of September, I got what I thought was my period. But I noticed something was different. It was much shorter and lighter. Then a week later, I started feeling nauseated. Even vomited. And I was exhausted. As of three days ago, my breasts are getting very tender. Even wearing a bra or t-shirt drives me crazy. And my lower back is really achy... should I be taking a pregnancy test, or what do you think??