Is it possible???

Hello, this is my first time posting here. :) I came off birth control in March or the beginning of April, since then my cycles have been about 23 days. My period was 6 or 7 days late this month, but it did come. (sort of) It was very light, not quite spotting, but much lighter then I'm used to, and lasted 4 days. For the last 2 days i've had some very light spotting thats a brownish color. For the last 4 or 5 days i've felt horrible. I've been exhausted, sick feeling, urinating a lot more, i have no appitite, for the first few days I was constipated, but for the last 2 i've been running to the bathroom with diarrhea (TMI sorry!!!) My breasts are not as tender now as they were before, but they're itchy. Is it possible to have your normal period (or what seems like a normal period) and still be pregnant? Has anybody else had this happen, or could this just a very inconveniently timed flu (which is what I suspect).