I am scared that I am pregnant. I am on birth control and take it everyday at the same time. I have been taking it for about 4 months. I had intercourse on the last day of my sugar pills which would be on Saturday and it's now Thursday and the past couple days I have been feeling cramping and im tired and also have been feeling a little nauseous. Is there anyway I could be pregnant? How long do I have to wait to take a pregnancy test. I took one yesterday and it was negative.