I'm 18 years old and last month my period came early on January 5th. I had sex a few times during that month, but every time it was protected and I checked the condoms to make sure they were not broken. I am known for having high anxiety and panic attacks, and I've been worried about this ever since. Now it's February and still no period. I feel bloated, but it comes and goes. Other than that no period or pregnancy syptoms. I took a pregancy test on Feb. on the 7th and it was negative. Now I've never missed a period before. So could this be stress? or what?