I've been taking birth control since I became sexually active in March. My period has always come on time and it has never been late before I was on birth control or during. Now my period is two weeks late. I took two pregnancy test a week after and both were negative How accurate are Pregnancy tests? Aren't they always correct? I'm really concerned I could be pregnant, I feel as though my bodies changing. I've been extremely moody not to mention getting nausea and headaches and I've even have sore breasts AND I am constantly tired. Looking at pregnancy symptoms from what I googled all of these are LISTED! I am very concerned that I could be pregnant. My boyfriend and I were not using condoms. I am only 18 years old, and I really don't know what to do?