When I was pregnant with my son, I had no idea I was pregnant, we werent even trying but I had my period December 6th, 2009 and about 2 weeks later my boobs hurt when I would lay down for bed, if I accidently bumped them it hurt sooo bad! Still, at this piont I was not even thinking pregnancy...I didnt even realize that my period was late at all, until I was complaining to my friend about how bad my boobs hurt...and she asked me if I was pregnant lol. So I looked at the calendar, and by this time my boobs had been huring for way over a week now, and I realized I was 11 days late. I didnt want to take a test because I was nervous, 2 days later I woke up and had to run straight to the toilet lol I was sooo sick! So that was when I finally decided to test, and when I did it was about 3 and a half weeks after conception. So I was 5 weeks pregnant, but only 2 weeks past conception when my boobs were hurting, its usually the first sign! Even before you miss your period, but sometimes sore boobs are a sign of your period too...unfortunately.