Hi, I have been on tri sprintec for 2 months, missed a few pills but always caught up. I had my period two weeks ago. Lighter then usual. Was fine for a week, then a week ago I noticed spotting that has not stopped. Could I be prego? I find myself to be nauseous at least once a day and peeing more frequently, I have one son but all tests even dr administered ones said negative until I was 2 1/2 months along. I need advice, plz help.