I have always had irregular periods since I started having one. I started my first period when I was 9 years old, I am now 22 years of age. I just had my period for the first time in 1 years about a week ago and it last 7 days. Normally when I have a cycle it last for about 3-4 days and I get them 2-3 times a year. Long story short, after my period I had unprotected sex, can i get pregnant with a very irregular period? My doctor knows that I haven't had a period and she hasn't done anything about it or even recommended anything.