Dear member, Thanks for writing to healthcare magic. your concerns are valid. Unprotected coitus over a period of three years would have usually caused a pregnancy. If you have irregular cycles which is common in teens then ovulation and pregnancy may not occur. As you enter your twenties and cycles regularise you may conceive. another reason may be unprotected coitus causing infection and blocking the fallopian tubes. Also remember the male partner also has to have a normal semen parameters with adequate sperm count and motility if the partner has to become pregnant. I would recommend that protection from infection by using a barrier should be your priority now as you ate not trying for a baby now. Thanks. Dr Bhagyashree.