It is difficult to determine the exact date of conception without more information. However, based on your ovulation day being on the 7th and having unprotected sex on the 2nd and 6th of December, there is a possibility that conception occurred during this time frame. Sperm can survive in the female reproductive system for up to five days, so it is possible for fertilization to occur even if intercourse happened a few days before ovulation. To get a more accurate estimate of your conception date, it is recommended to consult with a healthcare professional or use an ovulation calculator. They can provide personalized guidance based on your menstrual cycle length and other factors. Additionally, keep in mind that conception may not always result in pregnancy. If you suspect you may be pregnant or have concerns about your fertility, it is best to seek medical advice from a healthcare provider.