Welcome to HealthcareMagic. A woman ovulates 14 days before menstruation
, sperm can survive in the vagina for 3-5 days and the ovum can survive up to 24 hours. If your cycles are regular then one week before or one week after the day of ovulation is considered to be fertile period. So it can be the act of 14th jan which could have resulted in pregnancy
. However confirmation of gestational age
can be done by ultrasound uterus
. The sex of child cannot be determined apart from ultrasound and it is not disclosed as it is illegal.
Hope it helps you. Regards.