What is necessary in order for pregnancy to occur
1. Ovulation is essential;
2. Intercourse must take place during the fertile phase of the cycle;
3. Your partner’s sperm count must be adequate to ensure that a sufficient number actually reach the egg;
4. The mucus in the cervix must not be unfavorable and/or hostile to the sperm;
There must not be any mechanical barrier preventing fertilization from taking place, such as blocked fallopian tubes or adhesions around the ovaries preventing the egg from gaining access to the tube and sperm.