I am on the pill and my period always comes at least 2 days after I take my last active pill, but this month it came the day after.It seemed to be normal once it started. I didn't really think much of it, but I have had a queasy feeling in my stomach for about a week, my back has felt achey, and have had a couple of severe 'migraine' headaches. Is it possible to have what seems to be a normal period and be pregnant?