I am almost 100 percent certain that i became pregnant on the third of march , which was also the first day of my period that month. In addition i also had my full 5 day flow that i am used to.I have been to the doctors and i am pregnant but even she says that i am probably mistaken about the date of conception.The chances however of me being off are almost impossible (except for the sperm waiting around thing i have read about but that means 6 or more days and i don't think that can happen). I am now wondering how rare it is to conceive at this time , and if there are any additional concerns i should be having about my pregnancy because of it .