Current in Fresno on my ob-gyn rotation. Fresno is a cool town, and medical students get free housing! So far, I like how ob-gyn is such a great mix of medicine and surgery.
Public Service Announcement: Ladies, PLEASE KEEP TRACK OF THE FIRST DAY OF YOUR PERIOD. In clinic, less than 25% of women know the date of their last menstrual period (LMP). This is just sad and pathetic, because obviously it's not hard to keep track of your period using a calendar, but rather indicates that medical professionals suck at teaching patients how take charge of their health. This will also come in handy not only if you're pregnant, but also if you show up at the Emergency Room with appendicitis...they will want to know your LMP.
Don't worry about anything more than the FIRST DAY of your period.