General sex

Alicia. • My names Alicia me and my boyfriend have been trying for 8 mths now I have a 4 year old son and he has. 5 year old son
Me an boyfriend been trying 8 mths straight he has a son and so do I
​I had the mirena and it fell out after 3 years . We have sex every single day so I'm not sure why I'm not getting pregnant ? Any ideas ladies