Isnt it ironic?

I was 23 years old, not married, doing all sorts of drugs, underweight, unhealthy and irresponsible. BAM i got pregnant. My son changed my life. I never touched drugs again. He became everything for me. I am succesful healthy and drug free ever since the day i got that positive pregnancy test. Here I am 7 years later healthy married a wonderful family and in the perfect situation to give my son a sibling and of course i cant...i take my vitamins everyday.i use my opks dr say both my husband and i are perfectly healthy so now that i am ready and fully prepared i cant get pregnant.but when i was a brat living a horrible drug fueled life i was able to??makes no frustrating. .