Doctor I had sex on 25December and on 3TD of...

are you pregnany after having intercourse and getting the expected period in time ؟
No , that means you are not pregnant even after having another faint line
How  to increase the chance of pregnancy?
The day of ovulation is calculated through several things, including the symptoms of ovulation, such as a high temperature,  the temperature can be examined by making a daily examination of the body temperature, and when it rises by half a degree, this means the occurrence of ovulation, as well as other symptoms such as breast pain, flatulence and pain on one side of the abdomen It is the side of ovary that produced the egg for this month.
Also, there are screening tools sold in pharmacies that calculate the extent of a woman's fertility. These tests can be done at home as they depend on measuring the hormones in the woman's urine.
Finally, the ovulation process is expected on the fourteenth day of the first day of the onset of the menstrual cycle
Therefore, we recommend that there be intercourse during the fourteenth, fifteenth, sixteenth and seventeenth days in order to increase the likelihood of pregnancy, because as I mentioned, the egg remains about two days
What is the ovulation process?
It is the process of removing the egg from the ovary to the fallopian tube in preparation for fertilization and lasts for two days in the fallopian tube ready for fertilization.

It's pleasure to get your questions