Pregnancy depends on having frequent sex during fertile days of a woman's cycle, below is more information for you -
If you have a 28 day cycle, with ovulation typically happening on day 14, the ‘fertile window’ starts on day 12. If you have longer cycles, say 35 days between periods and ovulation happens on day 21, the ‘fertile window’ starts on day 19. If you have very short cycles, say 21 days and ovulation happens on day 7, your ‘fertile window’ would start on day 5.
Besides all of this info, you should eat healthy, sleep well and be stress free