Follicles 18*12mm are discharged and can usually get pregnant. You can appropriately increase the frequency of coitus, thus improving the chances of pregnancy. Follicle 18*12mm belongs to the mature follicle, after the mature follicle is discharged, couples can increase the frequency of coitus appropriately, which can mostly achieve the purpose of successful fertilization. Usually, you can use early pregnancy test paper to measure the value of human chorionic gonadotropin in urine about 14 days after intercourse, so as to clarify whether you are pregnant or not. Alternatively, a blood test for human chorionic gonadotropin can be done 7-10 days after intercourse. Couples who are preparing for pregnancy need to get enough rest and avoid over-exertion. At the same time, pay attention to local cleanliness and hygiene to avoid infection. Maintain a positive and optimistic mindset, do not have a negative mindset. If you fail to conceive for a long time, you need to consult a doctor in time to find out the cause of the disease.