So I have been feeling nausea on and off for the past week and was getting very stressed out that I might be pregnant but I just had my period two weeks ago, is this possible? I just started birth control (Tri-Nessa0 and I know nausea is not one of the side effects listed anywhere. But I can't wait long to find out because last night the condom broke and my boyfriend is buying me Plan-B, I don't know what to do. If I am pregnant, and take the Plan-B, won't that cause birth defects on the baby?