One time

Okay so just a question? How many of you just got pregnant off trying once? Normally my fiancé and I do it every other day but we been deciding to take it easy cause if I got pregnant last month or this one I would be between 8-9 months pregnant when we move and this month was super hard cause my fiancé left the day after I got off my period and was out of town my whole fertile week so we just had sex for the first time where he had came in me since last monthZ what's my chances??