7 days late

May be it is a very naive question but i have some doubts, i am currently 7 days late from my period, tested once and came negative, having hard core sex at this stage effects the conception or loss of if there is positive embryo? And orgasm at this stage is normal? I came back home after 1 week from my mom's place and my husb is getting crazy, at this point we are unsure about pregnancy, still having sex influences possible pregnancy? Please share your experience, first time TTC