With above sexual activity, you CAN'T get pregnant as you did sex just prior to period due date. Those days are NOT fertile.
You have to do unprotected sex during fertile days (11th to 19th day of each 28-30 days cycle) or ovulation day (14 days prior to next due date). You can use ovulation prediction
kit in the mid cycle. It will help to maximize chance of pregnancy
Take Vitamin and folic acid
supplements for 3 months prior to pregnancy. Good luck.