My last period was January 4th, and I have not yet got my period this month. My periods before last month all came around the 7th, but were extremely irregular before September (note: i took plan b in august) Since January 4th, i have only had sex twice, jan 16th and jan 26th. We used a condom both times and he did NOT finish either time, we had to stop in the middle of it! I am not on birth control. I believe that this missed (or potentially late) period is due to stress because i have had a lot of problems and stress this month including a break up, starting a new semester, etc. I also read that missed or late periods could have something to do with starting a new schedule, and i have been waking up a lot earlier this month for my classes. I also started exercising and going to the gym lately and have lost 2 pounds so could that have something to do with it also? Please tell me what you think!! I am scared to death that i may be pregnant. Please send some advice, and what you think