hi I was wondering if someone could help me with a little question,me and my boyfriend are currently trying to concieve we are both in our early twenties,this is about our fourth month of trying and still no luck as of yet.Anyway we have tryed to have intercourde this month on the days I should be most "fertile" anyway,im getting a bit worried im worried there is something wrong with me because I havnt yet conceived,however ther are some things my partner is doing that may effect it.He smokes cannabis from time to time,i know some of you may think this is disgusting,he is not a druggy or anything,but would this effect things? Also how early can you do a pregnancy test? Im not due for my period for a week and a half,can you have very early pregnancy signs? I.E a few days after conception? I have been feeling very nauseous morning and night,irritable and tired.I have tryed investigating these questions but most sources give different answers.Why does a pregnancy test have to be done after my period is due.Any help would be appreciated.