If your last menstrual period started on December 22nd and ended on December 26th, it is important to note that the average menstrual cycle is around 28 days. Based on this information, you are likely to ovulate around day 14 of your cycle. However, every woman's cycle is different, so it's essential to track your own ovulation signs or use an ovulation predictor kit for more accurate results.
If you are trying to conceive a baby girl, there are some theories that suggest timing intercourse closer to ovulation may increase the chances of conceiving a girl. This is because female sperm tend to be slower but more resilient than male sperm. By having intercourse a few days before ovulation, it allows the male sperm (which are faster but have shorter lifespans) to die off before reaching the egg, giving the female sperm a better chance of fertilizing it.
To determine when you can take a pregnancy test, it's important to wait until after implantation occurs. Implantation typically happens around six to twelve days after ovulation. Therefore, if you had intercourse on the 3rd and 8th of your cycle (assuming a typical cycle length), you would want to wait until at least day 20 or later before taking a pregnancy test for accurate results.
Remember that fertility and conception can be complex processes influenced by various factors. It's always a good idea to consult with a healthcare professional or fertility specialist who can provide personalized advice and guidance based on your specific situation.